I was going to make SR stencils awhile back for people to print but never got around to it. I guess I'll do it sometime, although, making your own is as simple as drawing or printing what you want on a piece of paper and cutting it out.
Stencils are not complicated.
When applying the stencil (with spray paint I assume) make sure you mask off everything you don't want to get colored and another thing that helps to get a cleaner image is using spray adhesive on the back of the stencil so it sticks to the griptape. If it is stuck to the grip tape paint can't float underneath the stencil and give that "cloudy" look around the edges.