I need a wee bit of help. I bought my book and received it. I took it to local Office Depot to have it spiral bound a week and some days ago. They sent it out somewhere and I won't get it back for another week. Dummy me..the only thing I remember about the first challenge is "purple" and "rail fence". Can someone tell me if the challenge is to ONLY use purple or can other color be used. Also, any size specs? I have a plan and I'm headed to a retreat where I plan on working on this. Thanks so much to anyone who can give me the info.