The back is a darker green, which would do fine with either color. Purple, green and orange are all secondary colors and therefore play well with each other. I was sort of tending toward the orange because I thought it made it "pop". Stringing some of the colors together is a good idea, too, and I hadn't thought of that. Think I'll sleep on it and look at it again in the morning with brighter eyes and more energy! This is a panel that I had seen on this sight and thought, WOW! Ethan would love all the colors and the dinosaurs were so cute! I did the over-all panto because we are flying to see them and the new baby on Aug. 16, and I need to get both done before I go. I'll post a picture of it with the binding when it is done.
This group is fantastic! Can't believe I can get 3 pages of opinions in a couple of hours! Thanks so much!