Oogoo is a recipe for silicone caulk that can be shaped by hand and sets by itself. Basically it's just hardware store silicone mixed with corn starch and oil-based paint.

I've made a few adjustments to the workflow given in the original link. Here is how I use Oogoo:

1. Squeeze some silicone into a disposable cup. I use the cheapest one found at the store. No matter what the original guide says, mine works fine even though it does not smell like vinegar at all.
2. Add about 1/10 in volume of oil paint. Some paints mix better than others, but pretty much any oil-based paint will work.
3. Stir with a stick until the paint is completely mixed in the silicone.
4. Add about 1/2 in volume of corn starch.
5. Stir again, for about 1 minute. Don't worry if it seems a bit "dry" at first, the starch will mix up soon enough.
6. Now comes the first major difference from original guide. Put on some disposable gloves, if you haven't already. Take some corn starch and spread it over your hands.
7. Using the mixing stick, dig up the Oogoo from the cup, preferably in one big blob. Gently touch it all around until it is covered in the corn starch and the surface is no longer sticky.
8. Drop the blob on your hand and spin it between your hands to make it a round sphere.
9. Now you have a nice soft blob that can be shaped but is not sticky anymore. You can take the gloves off now and release your inner artist by squeezing and stretching the blob to reach the shape that you want. If it begins to feel sticky, just add some more corn starch.

Now, when making some specific object there is often some Oogoo that is left over. What better use for it than to make small animals?