I just used stuff from my yard. I painted the whole truck olive drab green, and then used pine boughs, cedar boughs, manzanita branches, and oak leafs to create the shadow look. For example, if you put an oak leaf against a green truck and spray it with khaki tan, you get the Khaki tan overspray covering the green, but when you pull away the oak leaf, that area remains green. Do this with 4 colors and 4 or 5 different types of trees or brush, and you get something that looks like mine.

'87 4runner 37x12.50x15 MTRs
SAS, 4.88's, rear+front e-lockers
4x4Him --- Christian 'wheelin
4x4Him National Forum