Your son will love it, no matter what choice you make. I like your layout best of all three - it is "organic".
I see two areas toward the bottom that have large blank areas compared to the rest of the layout that is filled evenly. Can you add a family picture or two to make it even more personal for him? As for the fabrics: I like both reds - they play nicely together. If you use the patterned one, the blocks will appear more subtle. If you use the solid, the blocks will pop more.
I see a small stripe of an ochre-yellow under the black block in the upper center. I really like that with the reds. That color is repeated throughout some of the blocks and it would go good as a frame.
Hope that helps.