I love a super random crazy/scrappy quilt! I don't have the least bit of trouble making them - I really LIKE it when I end up with a couple of colors next to each other that I wouldn't normally choose...I just roll with it and so far zero regrets. In fact I think my taste in color has broadened considerably since I started quilting.
I keep a scrap bin going and when it's too full to close I know it's time to make a crazy quilt or two. I do foundation-pieced 12" blocks on muslin and it's so much fun to just grab stuff and stitch it down however it'll fit. I pay zero attention to color, value, pattern or style EXCEPT I try to never put two matching pieces together. Those end up being some of my favorite quilts! So much to look at, and of course all the little bits and pieces remind me of the quilts they came from in the first place. Spare/failed blocks make it into these quilts too.
Plus, crazy quilts are great for practicing FMQ - all the crazy shapes and colors really hide a lot of boo-boos. LOL