Being grown up usually means you can't publicly play with toys, unless they're of the sex variety, or even more degrading, because you're starring in The Santa Clause III. For a non-shameful option, add "wearing French cuffs" to that list, thanks to Oak Cufflinks.
Because they care deeply about you, the trifle virtuosos at Oak have handmade 42 styles of silver-backed cufflinks, with the bling made of certain whimsical memories from your childhood, from Lego blocks to board game pieces -- so, frequent distractions from abject friendlessness. Just intro'd links include a full range of Legoland classics from traditional blocks (green, brown, black) and various accessories (pizzas, ball caps, tires, dragon shields, Darth Vader heads), to a surprisingly extensive variety of old Lego NBA players: Jerry Stackhouse on Detroit, Shaq & Kobe in LA, Dirk in Dallas, even a C's-era Antoine Walker, the once-dynamic point forward who slowly devolved into Employee Number Ate. For those who dug games on boards, they've got nearly all the pewter Monopoly character pieces (race car, top hat, and everyone's favorite, the thimble!) and Scrabble letter combos of H & A and F & U -- put them together, and you probably suck at Scrabble.
If you'd prefer to be more modernly immature, they've also got links attached to white Mac laptop command key, though the only command that's truly key should be "Let Tim Allen's career die with dignity".