For those who have already tried their hand a rubberstamping, explore this:
layered stamps! (with a wash of watercolor underneath)
You start with one drawing and transfer the same image onto two (or more) rubber blocks, and carve out the pieces with “one color per stamp” in mind.
For the koi, I made two stamps: black for the outline & black spots, and orange for the color of the fish. I left out some white spaces in between the stamps for the white base of the fish. I love how the layered stamps create off-registration marks.