Do you want the comforter to be functional (i.e., warm), or mostly decorative? What's your price range?

Depending on the answers to those questions, I would suggest having a look at Kambriel. It's expensive, but her work is outstanding; a coverlet from her would qualify for heirloom status. I bet you could get whatever mix of colors on the patchwork coverlet you wanted, maybe even provide your own fabrics and get a discount.