I like "controlled scrappy" where I use one color in tons of different tones, prints, patterns, etc. Another way is to cut it out, lay it out on the floor or design wall, take a step back and see if you like it. I also like to do scrappy quilts that are all pastels or all primary colors or batiks. You get the idea. I don't like to mix everything together. Just have fun with it. If you hate it, donate it and learn from what worked and what didn't.