Okay, I gave my father his birthday present, which I foreshadowed here. My dad works in television, and we play cards a lot, Michigan rummy, with jokers wild. So I combined the two.
My digital camera, combined with so-so lighting in our kitchen, didn't capture the colors so well, but I am pleased with how rich they feel, in person. Other than drawing a few guide lines, I opted to do the border design freehand and not measure it out precisely. Next time, I think I shall try the opposite, more to keep symmetry and balance on the sides, than to get those diamonds uniform, but I still like it this way.
I am quite pleased overall, and I think Dad also really did like it.