I've done both the controlled scrappy and the "brown bag" scrappy. Depends on the idea I have at the time. Right now I am sewing all those odd triangles together that have been left over or cut off of strips, snowballs, etc. I just match up those that are close to the same size, then square them up. This is something I do when I have trouble sleeping or awaken early and don't want to wake the rest of the household up. When I'm done I'll decide what quilt design I'll make.
This year I have been working on depleting my scrap stash. It looks like I'll be doing that next year also.