The primary ingredient of most actual kitty litter is clay, which is gray. Unfortunately, there are very few gray items in cooking (except for a few fish) so it is difficult to approximate the correct color. In the Ahl cooking laboratory, I found that the above mix of ingredients resulted in a final product that was too dark. Thus, I suggest using the crumbs from only about one-third to one-half of the chocolate cake with the full white cake. This will result in a better base color.
Second, most cakes today are designed to have a moist texture, which means when you crumble the cakes, the resulting particles are too small, more like sticky fine sand (bad) than dry course gravel (good). Thus, I suggest baking the cakes for longer than normal. You want the cakes well-done (not burned, of course) so they'll crumble into gravel-size pieces. Similarly, you want your cookies broken up in gravel-size pieces. My food processor ground them up much too fine, so I put 6 or 8 cookies at a time in a zip-lock bag and pounded them with a rolling pin. A hand chopper would do as well. I also found that a large package of pudding was way too much; a regular 3.4-oz package will be plenty.
Last, it is very difficult to find standard or "fun" size Tootsie Rolls these days. However, Tootsie Roll "Midgees" will do just fine, except you may have to use more of them. If you nuke three of them in a microwave for 20 seconds, they'll be just right to shape and pull.
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