I love fishing in muddy waters. That's because I believe that some of the best investing ideas are in sectors into which few sane investors would bother to venture. Think about it. Aren't treacherously unloved industries the ones crying out the loudest for reinvention? Of course.

Our Motley Fool Rule Breakers newsletter service specializes in disruptive technologies -- and what can be more worth disrupting than what's not working? I'm not suggesting that a sector has to be cursed. Simply being stalled will do just fine. When the automobile displaced the buggy whip or the computer relegated the typewriter to an office-supply-store relic, it wasn't because horses or electronic typewriters had cooties. They just weren't exactly booming niches -- and hence the search for dynamic replacements that would enhance their intended purpose while providing lucrative opportunities for the agents of change leading the revolution.

So let's look at some really great companies doing things right in some really atrocious industries.

Marvell Technology Group (NASDAQ:MRVL) is a chip maker. While that often conjures images of cyclical companies with more highs and lows than a Grateful Dead tribute band concert, Marvell stands out in the crowd. In fact, it has reported higher sequential revenues for 30 consecutive quarters. That's not the kind of consistency you'd expect from a semiconductor specialist, but that's exactly what Marvell has delivered. The cash-rich company's pint-sized chips can be found in hot-selling products such as Apple Computer (NASDAQ:AAPL) iPods and the upcoming Microsoft (NASDAQ:MSFT) Xbox 360 gaming console. With digital-music-playing devices, video game systems, and cellular phones all looking to beef up their significance in everyday life, Marvell's heady growth is bound to continue.

Provide Commerce (NASDAQ:PRVD), the company behind ProFlowers.com, is reinventing floriculture by streamlining the traditionally cumbersome and convoluted business of floral deliveries. A rose peddler by any other name is still a clumsy operator -- the flowers go through various layers of handling before finally reaching its customer. Provide Commerce ships orders directly from the grower, which means fresher, longer-lasting flowers at lower prices than the typical FTD network transaction. Because it has perfected the art of consumer-direct shipments of perishable goods, the company has also been able to launch virtual storefronts for gift meats and fruit baskets. Provide Commerce is looking to earn between $0.53 and $0.56 a share this fiscal year -- boosted by 770,000 Mother's Day orders earlier this month. The company has been able to produce healthier profit margins than competitors, and its efficient simplicity in the tired gifting space bears watching.

JetBlue (NASDAQ:JBLU) is a standout in what appears to be a truly hideous industry, where bankruptcies and billion-dollar deficits come with the aerial territory. JetBlue first took flight five years ago, a perfect time to crack the friendly skies. With the legacy airlines bursting with pension plan obligations, tired aircrafts, and fat contracts, a nimble JetBlue was able to offer fancy frills -- plush leather seats, personalized satellite radio, television programming at every seat -- and still turn a profit on discounted fares. The stock has been halved over the past two years because of disappointing earnings in 2004, but the company is ripe for a recovery. With a modest fleet of 74 jets that continues to grow, along with its new destinations, JetBlue's future will come in many colors -- none of them blue.

The Pantry (NASDAQ:PTRY) is taking advantage of the highly fragmented convenience store business by buying up chains that don't have 7s and 11s in their signage and turning them around to profitability. Back in April, when Wall Street expected the company to earn $0.13 a share, it came back with a $0.18 per share profit on a 20% surge in sales. While supermarket chains continue to struggle, The Pantry and its empire of nearly 1,400 convenience stores continue to feed the hungry and fuel the empty at a quickening pace. The shares have doubled over the past year, but the stock is trading at a reasonable 17 times the company's recently raised 2005 earnings guidance.

Great Wolf Resorts (NASDAQ:WOLF) builds upscale lodges with massive indoor water parks. (Talk about hitting two moribund industries with one stone.) Between the sleepy hospitality industry, where steep fixed costs make any vacancy a shame, and the seasonal amusement park business, with its unpredictable turnstile turns during the summer and cobwebbed silence during the balance of the year, Great Wolf is gunning for the tiara in two ugly beauty contests. Yet that's also why Great Wolf is so alluring. Its 40,000 square-foot watery getaways provide the resorts with year-round operating viability, and a growing trend toward shorter family vacations makes Great Wolf a welcome drive-to destination. The company is creating real value in its real estate -- it is able to sell condos to help subsidize a good chunk of the construction costs. Great Wolf will have just seven resorts open by the end of the year, and with so much room to run, it should defy the logic of the dueling dullards of lodging and seasonal thrill purveying.

Can successful growth investing be that easy? Not quite. But that doesn't mean it isn't a pretty good place to start. Two of those five stocks have been recently recommended in our Rule Breakers newsletter service, partly because they were kicking up a refreshing fuss in sectors that weren't just begging for better mousetraps -- they were begging to be rid of mice, period.

You are welcome to learn more about those two stocks -- and the many other monthly recommendations -- by taking us up on a free 30-day trial subscription. But even if you decide not to kick the newsletter service's tires to learn more about ultimate growth stock investing, always remember that there are tasty fish to be found lurking deep in cloudy waters. Throw out the line. You may be surprised at what you catch.

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Longtime Fool contributor Rick Munarriz really does enjoy ferreting for opportunities where others aren't looking -- you could probably call him an investing claustrophobic. He owns shares in Great Wolf Resorts. The Fool has a disclosure policy. Rick is also part of the Rule Breakers newsletter research team, seeking out tomorrow's ultimate growth stocks a day early.