Have you seen Liz Katsuro's website. She sells lots of jellyrolls that she cuts and has patterns for them as well. Here is a link to her page:
http://www.jellyrollfabric.net/Patterns_ep_41-1.html. I joined her email list to get ideas. I think I found her website while looking for a certain color grouping.
There are a couple of people who are selling "non-commercial" (i.e specific fabric line like Moda) jelly rolls that they create.