Other things needed for this project:
Emu egg (preferably more than one... I ruined the first and maybe the second)
White vinegar (fresh from the store: the newer it is, the more acidic)
Crayons (good ole Crayola)
Rock mold (this came in a diorama rock kit I bought at Michaels for this, but can be had online)
Talus (i.e. little jagged rock crumbs. Unpainted aquarium gravel could do in a pinch)
Gravel (i.e. larger jagged pieces of rock. Jagged is the key word here)
Putty (I used Aves Apoxie Sculpt, but any self-hardening putty-like stuff would do, so long as it sticks well to things)
Reindeer moss (I've seen the same stuff labeled as lichen)
Grass flock (came in another diorama kit, this one for grasses. Can also be had online or in a hobby store)
Foliage fiber (same diorama kit, the stuff looks and feels vaguely like the scrubby side of a kitchen sponge)
Glue (I used what came free with the kits, it smells like Elmer's to me. Any non-toxic, clear drying glue would do)
Clear casting resin
Very small twig wreath, or twigs and raffia to make one.
Plastic cups, knives, stirrers.
Brushes (here it really helps to have a few small and soft brushes, they are best for blending)
Rotary tool with a grinding tip and a small cutting tip.
Also, lots of time, patience, and a clean, well lit work environment (I used my office for a chunk of this project)