Finding a yarn substitution for Clapotis

I absolutely love the pattern Clapotis from Knitty. I'm currently trying to find a cheaper yarn to use in place of Lorna's Laces. Hopefully one from KnitPicks, Knitpicks does have several multi color yarns that are beautiful, but they are not the right weight. The only one they have in the right weight doesn't have colors I like. I'll have to check Elann. Either that or see if I can double stand one of the lighter weights in KnitPicks. Or maybe I can use Wool of the Andes and stripe it and carry the yarn up so I don't have to weave in too much.