That's a beauty! What do you charge for them? You could do them in the traditional ribbon colors, and people could get them for their fun shows rather than just another ribbon.... that's what I"m thinking, anyhow. Would be something fun, useful, and pretty too.
So, as you could guess, I would like to see them in blue and red.

Either silver or blue accents - the hearts are pretty but stars or horseshoes would look great too. Maybe clovers ??
blue & yellow is my fave. combo....
then of course, the dark/light of the same color combo. (Royal & light blue, Leaf green & pastel, etc..)