In his 2010 letter to Berkshire Hathaway (NYSE: BRK-A) (NYSE: BRK-B) shareholders, Warren Buffett proudly crowed:

"[N]ot a dime of cash has left Berkshire for dividends or share repurchases during the past 40 years. Instead, we have retained all of our earnings to strengthen our business, a reinforcement now running about $1 billion per month."

Then, in a drastic plot twist, Berkshire made this announcement earlier this week: "Our Board of Directors has authorized Berkshire Hathaway to repurchase Class A and Class B shares of Berkshire ..."

Does this answer the age-old question of whether it's possible to teach an old dog new tricks? (rimshot!)

OK, so nobody's teaching Buffett anything new here since the repurchase of Berkshire shares fits perfectly with his career-long obsession with buying pieces -- or the whole shebang -- of great companies at attractive prices. But this is still a departure from what Buffett has done in the past, so it got me thinking: What other new leaves might the venerable Buffett turn over at the spry age of 81?

1. Pay a dividend
This seems like a reasonable question to ask since the annual letter tidbit mentioned both dividends and share buybacks. He's done one -- could the other be on the horizon?

Unfortunately, the answer is "doubtful." It's not that Buffett isn't a fan of dividends in general. You have to go all the way down to Verisk Analytics -- a $245 million position -- to find a Berkshire holding that doesn't pay a dividend. Meanwhile, all of Berkshire's major positions -- representing tens of billions of dollars -- pay dividends. Many, including Coca-Cola, Procter & Gamble (NYSE: PG), and Johnson & Johnson (NYSE: JNJ), are part of Standard & Poor's venerated Dividend Aristocrats.

However, Buffett sees his job as capital allocator in chief, and as such he's dedicated to using Berkshire's cash to increase the returns for Berkshire shareholders. Buying back shares at the right price can do just that, but paying a dividend is akin to him saying "I give up."

2. Drink Pepsi
Buffett is a renowned Coke-drinker, which could make a lot of sense in light of Berkshire's $13.6 billion stake in Coca-Cola. But could he be persuaded to diversify his cola intake and sip the flagship product from rival PepsiCo (NYSE: PEP)?

Though Buffett used to be a Pepsi drinker, I think that's a long shot. If switching favored cola brands was that easy, there would be little reason to be fanatical about Coke or Pepsi stock. However, Buffett did tell CNBC that he likes munching on snacks from Pepsi subsidiary Frito-Lay (he mentioned Fritos, Cheetos, potato chips, and Munchos), so perhaps he could consider adding Dividend Aristocrat PepsiCo to his portfolio?

3. Watch out Billboard
Buffett lit up living rooms earlier this year with a cameo in The Office. He's also appeared in Wall Street: Money Never Sleeps, I.O.U.S.A., and All My Children. He's quite the accomplished actor.

But unless he has an alter ego named Jimmy, I don't believe he's put out a music album yet. The man plays a mean ukulele, so I think it's high time he hit us with some tunage.

4. Smoke 'em if you got 'em
I noted above that Berkshire's portfolio holdings suggest that Buffett is a pretty big fan of dividend payers. And he's certainly a fan of companies with great brands and superior competitive advantage. So it may seem strange that Buffett doesn't own two companies with great dividends and one of the strongest global brands. I'm talking about Altria (NYSE: MO) and Philip Morris International (NYSE: PM), owners of the Marlboro cigarette brand.

Personally, I made the decision to sell my stake in Philip Morris International because my conscience couldn't handle owning a cigarette manufacturer. While Buffett's had the "swell guy" image through most of his career, he hasn't always been swayed by those kinds of considerations and has come under fire for that reason in the past.

Of course, Berkshire's avoidance of cigarette stocks could be more than a moral thing. If Buffett views the regulatory risks facing these companies as unacceptably high, the addictive nature of the product and Marlboro's brand power may not be enough to influence him.

5. Warren the health nut
Dude, Warren, we Berkshire shareholders love having you at the helm and don't want to see you going anywhere. I can't say that I'm terribly encouraged by the fact that all I hear about your eating habits is your love of cheeseburgers, Coke, and snack foods.

My suggestion? Go vegan, get on a crossfit regimen, and stay your healthy, vibrant self for another 81 years (a guy can dream, right?). Too much, too soon? How about alternating Diet Coke with good ol' water (Dasani is a Coke brand) and munching the healthier options from Frito-Lay like Baked Lays, Baked Cheetos, and Stacy's Pita Chips.

6. Give us the keys to the kingdom
The share buyback announcement may give us the best glimpse yet into just how much Buffett thinks Berkshire is worth -- at least, that it's well worth buying the stock at up to and including 1.1 times book value. But we've never gotten Buffett to give a really specific breakdown of exactly how he thinks about the value of Berkshire. For investing and valuation nerds like me, a peek behind the curtain would be like comic book fans getting to try on Superman's cape.

7. Take down the World Series
No, not baseball, though I'm loath to put anything out of Buffett's reach. However, the man is a bridge whiz. Bridge doesn't get televised on ESPN, but the World Series of Poker does. Anybody doubt that Buffett could make a serious run at the main event?

Will he?
If you want to keep an eye on whether Buffett -- who I'm sure reads my columns -- takes up any of these suggestions, go ahead and add Berkshire Hathaway to your Foolish watchlist. If you don't have a watchlist yet, feel free to get one started for free by clicking here.

In the meantime, head down to the comments section and share your suggestions for the good Mr. Buffett.