My brother told me about this free photo editing software. He says it work like Photoshop. I personally don't use Photoshop, as it's way too expensive, but I have used Paint Shop Pro for years. You can't beat GIMP2 for the price :-)
I was trying to decide how to lay out my fabric for my bargello. I took the first photo below and created the second one. (Unfortunately, I don't have enough fabric to make #2, but I was dreaming!)
Try it. If you've ever used photo editing software, you shouldn't have any trouble.
bargello design-created with GIMP2