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Hi, DragonMaster:  You can make heat-free rubber molds of considerable
durability for many repeated castings out of simple clear silicon
window-caulking, available in tubes in most hardware centers, for next to
nothing.  You can also use fiberglass resin, sold in small amounts, mixed
with about 50% by volume inert filler, such as plaster or sand, colored
with a bit of carpenter's chalk, for the castings, also for minimum
expense.
A lot depends on the complexity of the form of your models; simple rather
conical forms are easiest, but once you catch on how to make a 2-piece
mold, your patterns can become much more intricate, taller, etc. Build the
silicon up on your model in thin coats, letting air-dry between, until
it's maybe 1/8' thick all over, remove it from the original like a sock,
inside-out-wise, and there's a simple mold.
You can paint the resin castings with model car paints.