When cakes are cooled to room temperature, crumble into a large bowl. Toss with half the remaining cookie crumbs and the chilled pudding. Line new, clean kitty litter box. Put mixture into litter box. Put three unwrapper Toostie rolls in a microwave safe dish and heat until soft and pliable.
Shape ends so they are no longer blunt, curving slightly.
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. Scrape them on top of the cake and sprinkle with cookie crumbs. Serve with a new pooper scooper.