There are a whole lot of scrappy patterns and ways to do scrappy. I did one scrappy that only had two colors, reds and neutrals. It was just stunning. It really wasn't a scrappy pattern either. There were at least 20 reds and around 35 tone on tone white to ivory neutrals.
I did two string quilts where I pieced on newspaper and made half the blocks all light and half all dark and then cut them in half on the diagonal and put the halves together with the strings running opposite directions. They didn't have any sashing at all. They turned out really cool and I just used whatever I pulled from the pile of strings. I pieced them on the newspaper so they would still be stable when I cut them in half.
I did two scrappy log cabins and just sorted into light and dark and pulled from paper bags. The rule was I had to use whatever came out of the bag unless it was already in the block. There were some truly ugly fabrics and some fabric combinations that clashed pretty violently in those quilts. They turned out just cool though.
I have one scrappy pattern that I use to make the girl's quilts. It's just square in a square blocks with black sashing and solid cornerstones. I put all sorts of wild and crazy combinations together in the blocks and by the time they're done they're just gorgeous.
There's a thread titled something like "scrappy quilt show" on the board in pictures I think, it'll give you tons and tons of ideas.