I third making Dirt. It's super easy, quick, no bake, and delicious!
DIRT DESSERT
1 1/4 lbs. Oreo cookies, crushed
3 lg. pkgs. vanilla "Instant" pudding
12 oz. soft cream cheese
6 oz. Cool Whip
4 1/2 c. milk
1 flower planter (pot), approximately 10 inches in diameter
1 gummy worm
1 bunch plastic flowers
Whip together pudding, cream cheese, Cool Whip and milk. Layer flower planter with crushed cookies and pudding mix (be sure crushed cookies are on the bottom first) and save crushed cookies for the top of your planter. Decorate with worm and flowers. You may want to wrap stem of flowers in a baggy for easier cleaning and reuse. You'll be surprised at the comments of your "Dirt" Dessert!
(From http://www.cooks.com/rec/view/0,1613,151183-255201,00.html)
We sometimes substitute the different flavors for the vanilla pudding. Chocolate fudge has been a big hit, but that will depend on how much you like chocolate.