There are many books and patterns that use fat quarters. Look through them. I'm sure your fat quarters would MOSTLY fall into 4 piles that go together. You just have to work out what those piles are.
I too have a large fat quarter collection (many from a New Years Day door prize). So, I get where you are coming from. I have made 2 fat quarter quilts from them already. I traded ones I absolutely couldn't use for something that I could use.