Because I needed some mindless fun, I did the totally scrappy, no rules approach. But I am ready to admit that I have a problem. Most of my older scraps are colors and prints that I call murky. Burgundy, gold, navy, those dusty blues and pinks from the eighties (UGH) and a lot of neutrals with a decidedly tea-stained look to them. I can deal with this to some extent by pepping them up with bright yellow, orange and purple, but it's not sitting well with me.
So, I may switch off and do something else where it's "themed scrappy" such as all blues, all greens, or all purples with the contrast of a different color peppered in here and there. I did scrappy green in this quilt, and I was really happy with how it looked.
Main color with a value spread from light to dark, and a range of hues. If it's a secondary color, you can vary towards both of the primaries that make it up. In this quilt, for example, the greens included both blue greens and yellow greens.
Color splashes can be the complementary color, or not, and it still seemed to work. In this quilt, the color splashes were within the individual fabrics used for piecing.
How about you, if you are a scrap quilter? Are you a no rules scrapper, or do you prefer to be a limited palette scrapper?