What should I do?

Okay, the thing is, I love the look of a scrappy quilt but can't seem to get my head around making one. I have used jelly rolls and fat quarter collections and they worked out fine because someone else was picking out the fabric. I'm afraid if I try to do it myself I'll end up with just a mess of things that don't look right together. Should I just jump in and try it; cut, say, 5" squares of a whole bunch of my scraps or just stick to what someone else has put together because that is where I am most comfortable. (sigh) How do YOU decide what to use to make a scrap quilt?