This hint comes from Ruth (otherwise known as Vicki's Mum).
How to not worry about gauge when knitting charity squares:
use any ply wool
cast on 1 stitch
increase x1 beg each row till 6 inches or a big as you want your square, then decrease x1 beg each row till 1 stitch. Crochet squares together. Nerrida at Zonta last night had a great rug made this way all different muted colours joined with blue crotchet.
I'm definately with the crochet idea. Who would want to sew squares together? Mind you, I'm working on Starsky at the moment (cables driving me bonkers) so no chance of me doing charity knitting of any kind!