This is a perfect opportunity to experiment with yarns that you love but haven't used before. Play with interesting novelty yarns or use up yarn from your stash. Pick a colorway that you like and mix and match different yarns from within that colorway; work with two or more yarns held together for an interesting effect. The possibilities are endless!
In Garter St, 11 sts = 4"/10 cm; row gauge is not important.