'Modern Koi', Inspired by "Koi Traditional Japanese Painting", Watercolor Illustration by Jennifer Kraska [b., American], ~ [Isn't a tattoo but it has a similar theme to my idea. A beautiful sketch like this would be stunning].
Self Portraits? Divide the page into 6 squares and paint each one a different colour. When dry experiment with different prints on each square. Children draw themselves with a sharpie, then cut out and stick over printing.