When cakes are cooled to room temperture, crumble into a large bowl. Toss with half the remaining white cookie crumbs and the chilled pudding. Line new, clean kitty litter box. Pour mixture into litter box. Put three unrapped Tootsie rolls in a microwave safe dish and heat untill soft and pliable.
Shape ends so they are no longer blunt, curving slightly.
Repeat with 3 more Tootsie rolls and bury in the 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 the remaining Tootsie rolls 3 at a time in the microwave untill almost melted. Scrape them on top of the cake and sprinkle with cookie crumbs.