OK, I know the idea seems outrageous, but I found the recipe in the paper several years ago and passed it around at work. Everybody got a big bang out of it. So, at the risk of offending someone, here is the recipe:
KITTY LITTER CAKE
1 Box spice cake mix
1 Box white cake mix
2 small pkg instant vanilla pudding
1 12-oz pkg vanilla wafer cookies, crushed
6 to 10 regular-size Tootsie Rolls
Green food coloring
Prepare 2 cakes and pudding according to package directions. When cooled, crumble cakes into a brand new kitty litter pan. Then add the pudding and mix. Take 1 cup of the cookie crumbs and add a few drops of green food coloring and set aside. Mix the remaining cookie crumbs into the pan. Next, soften the Tootsie Rolls in the microwave for 10 seconds and shape to resemble droppings. Arrange them on top of the litter pan and sprinkle with the green cookie crumbs. Then sprinkle on a little powdered sugar. Serve with a brand new pooper scooper.
Serves 20 to 24.