Yippie! We have a quilting Cheerleader! :D Just what I never knew I wanted and always did!
Margie it will be fine, I promise you have me and you have Sandpat too! Not to mention everyone else to get ideas from and share with. Sew the best you can and it will be wonderful.
Any fabrics are fine as long as they stick to the theme of your group member. Prints, solids, plaids, batiks, wows it's all fine. The one thing I'm going to draw the line at is no handwovens, I don't know what I do but if I look at one it falls apart and that would be tragic to have happen. Think of the Christmas fabric as your "helper" that will help you out if you're not certain what the next row should be, instead of an "oh I HAVE TO use that". We don't have any have tos here. :)
Now I would really love another member for the large group - just one more. Is there someone out there hanging on the line but not sure?