About half of the quilts I make are scrap quilts, although I call them "controlled" scrappy quilts. I have heard the true definition is simply pulling one piece after another, not paying attention as to whether they blend together the way you want them to or not. (I could be wildly wrong, so someone please correct this if necessary.) I don't make mine that way. I find a pattern I want to use, and then find scrap fabrics that I want to use.
Sorry if this doesn't help you, but I'm sure others will reply and help you out with this. One site I use frequently is
www.quiltville.com for ideas.