I have a ton of yarn left over from some Christmas present projects and it's enough for me to make a ton of 6x6 patches. I think it'll yield enough to make an afghan big enough for my son's toddler bed.
Anyway, it's a modgepodge of colors: blues, pinks, purples, greens, yellow, orange, etc. What color yarn should I use to sew them all together when I'm done with the patches? Does it matter?