Depending on your skill level, you can design your own quilt. Is this something you want to do yourself? Or is this a group project for a crew?
There are several computer programs out there that you can use to "create" your design into simple to intricate patterns. If that is beyond your desire, price range or skill level, I would advise you to visit a local quilt shop & talk to the people who work there. Often they are designers themselves & love the chance to work on something new & challenging. Or they know of teachers in the area who may be willing to create something you would like. This could end up being free or less expensive than you would think. And it would free up all that time you are spending searching!
Let us know what you come up w/... & how it turns out!
"I can read and write if that's what you mean. I'm not thick or anything just don't ask me where the commas go."
Incendiary by Chris Cleave