So many ways I love crab... hard to pick just one. For the most part, fresh with cocktail sauce - nice presentation is in a martini or margarita glass with the sauce in the center, and perhaps, draping some shrimp over the rim of the glass - tail sides out.
A lovely presentation is ... prepared guacamole in the shape of a big star - (use a big star-shaped cookie cutter to form the guac) with fresh crab on top and lemon wedges surrounding the side of the plate.
I'm pretty much a purist when it comes to seafood/shellfish - but, other ideas are crab fried rice, crab stuffed shrimp, lobster or mushrooms, crab/seafood souffle. Crab salad is one of my faves.