That's going to be very nice! If you wanted to add another fabric or two I would go with an army green and maybe a taupe. However I don't know that you really need to add them. I've not done that pattern so I'm not sure how it works with various numbers of different fabrics. I would use more of the solids than the print I think, especially since you are putting the patches on some of them. As you lay it out you will get a feel for what will look best.