You can get turkey dyed in different colors, or use another material like raffia for the wing pads or back of a nymph.
As for color of the body, you can use different colors of dubbing, chenille or wool.
I make mostly just 3 different ones:
a big black one with black body and dirty orange thorax topped with a black dyed turkey in size 4 or 6 on a 3x long hook
a large golden stone with dirty yellow body and thorax and dyed brown turkey back size 6-8 on a 3x long hook
a smallish stone with peacock herl body and short clip of mallard wing for wing pads (not back) size 12 on a 3 x long hook.
These imitate the naturals around here. But you can make up some "crazy" color combos too if you want by using a variety of different materials like weaving wool yarn or chenille to get different colored top and bottoms, or using all kinds of different stuff for bodies and toppings.
Here's one that uses chenille for the body and squirrel hair for the topping. It's a very popular Great Lakes pattern for steelhead in all kinds of color combos using chenille and dyed or natural squirrel and may give you some ideas:
Fly Tying Instruction for begginers - Copperfly.net - The Springs Wiggler Flishing Fly