The cheesecake mini-thread reminded me of this one, which I probably
pulled from here originally:

Kitty Litter Cake

1 spice or German chocolate cake mix
1 white cake mix
1 large package vanilla instant pudding mix
1 package vanilla sandwich cookies
Green food coloring
12 small Tootsie Rolls
1 new (and definitely unused) kitty litter pan
1 new plastic kitty litter pan liner
1 new Pooper Scooper

Prepare cake mixes and bake according to directions (any size pans).
Prepare pudding mix and chill until ready to assemble.
Crumble white sandwich cookies in small batches in food processor,
scraping often. Set aside all but about 1/4 cup.

To the 1/4 cup cookie crumbs, add a few drops green food coloring and
mix using a fork or shake in a jar.

When cakes are cooled to room temperature, crumble into a large bowl.
Toss with half the remaining white cookie crumbs and the chilled
pudding. (Mix in just enough of the pudding to moisten it. You don’t
want it soggy. Combine gently).

Line new, clean kitty litter box. Put mixture into litter box. Put
three unwrapped Tootsie rolls in a microwave safe dish and heat until
soft and pliable. Shape ends so they are no longer blunt, curving
slightly. Repeat with 3 more Tootsie rolls and bury in mixture.

Sprinkle the other half of cookie crumbs over top. Scatter the green
cookie crumbs lightly over the top. (This is supposed to
look like the chlorophyll in kitty litter.)

Heat 3 Tootsie Rolls in the microwave until almost melted. Scrape them
on top of the cake; sprinkle with cookie crumbs.

Spread remaining Tootsie Rolls over the top; take one and heat until
pliable, hang it over the side of the kitty litter box, sprinkling it
lightly with cookie crumbs.

Place the box on a newspaper and sprinkle a few of the cookie crumbs
around. Serve with a new pooper scooper.

Now, if you want to make a true kitty litter cake, you might be
realistic.....

First, tip the cake pan on it’s side so some of the “litter” spills
out onto the table. Then scatter some half-melted Tootsie Rolls right
in front of the pan.Finally, thoroughly melt a few of those candies
and, with the side of your fist, grind them into the tablecloth. Stand
back, and admire your work.

Enjoy.

Donna Roberds