Gosh you all, thank you so much for the information. I feel better about starting on it now. I think I will order some of the "aged" looking muslin in an ivory color. I believe with the "busyness" of some of the batiks, it would be much better to have a solid background. Plus today, I found a 108" backing that is batiks but all in fall colors. I think that would be gorgeous on the back, unless I wimp out and buy the same muslin for the back because it's cheaper. (and that's probably exactly what I'll do too)
Good advice from everyone! THANK YOU so much!!!