Why not vertical stripes for a piano?
Stick to RAL if you are not using GMK colors btw
I tried this and it didn't looked that awesome
its a lot more awesomer imo
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I love the stripes in the Capriccio kit, however I think that it should keep the pattern from the above comment. The even stripes throughout doesn't look very piano-y. I think starting on the C note (having QA in black) is a good idea, but in that case, the Y, I, and P rows should be black instead of the T, U, and O rows. Pretty awesome that a full octave fits on an ortho, but keeping the keys as they are would keep the B note omitted (as the backspace row would act as a B Flat).
Alternatively, you could just include the entire R2/R3 rows and let people customize it as they wish (not sure how much that would drive up the overall cost). With QMK supporting MIDI, I think this could be a really cool thing to have if the colors properly correspond with notes.