Wrap some baker's twine or other string around a wooden block to create a graphic textured stamp. -can also use rubber bands- Stamp on inside of paper bags from grocery store or paper that comes in mailed packages, use as wrapping paper.
And that, children, is why you dont get tattoos ;) This idea kills me! and everything else about your body at this age "looks amazing" it's the tattoo that's the problem. Enjoy your life, who cares what you look like at