I'm currently making a scrap quilt using different blues and browns of repro or antique looking fabrics (light, medium and darks). But, am including a couple of yellow and red to add interest.
I've made many, many scrap quilts - some with planning, some just random. Three of them are behind me on my avatar. If you do a search here for Crumbs or Mile a Minute you can see what other Board quilters have done.