Scrap quilters are generally not that into matching everything. If they don't seem to go together, cut them smaller...that was the advice I recieved early on from a very experienced quilter. She also told me to start with patterns with quite a bit of background fabric showing to get used to mixing my scraps. The third bit of advice she shared was to throw the scraps in a paper bag and pull out one at a time if you have trouble putting 2 fabrics together that just don't seem to play well together.
Lastly, if none of the above hints appeal to you, share your scraps with someone who will cherish them.