This probably isn't the typical Spoonflower shop -- these are the kinds of things I wish were in the fabric store when I was a kid, bored out of my mind while my mom was there for hours on end. My Etsy and blog links:
Daorgeron -- Spoonflower's options are to the right of the fabric image. The widths depend on the type of fabric you want, but the two basic cotton styles are 42" wide per yardage. There are also yellow ruler templates along the side of the fabric image to help you visualize it.
Bethlas -- I uploaded a new version of the design. The red is MUCH more intense; the black is all the way at 0,0,0 in RGB, so it's as black as I can conceivably make it. Let me know if this works better. I've never ordered silk from Spoonflower, so I can't speak for how well their color matching works; if there's still problems with color matching (especially with the black), I would contact Spoonflower directly about it.
I got a swatch of this in the silk crepe de chine, because I am in the position to order many yards of it. The color is not as defined and graphic as in the image - the black is charcoal, and the rusty color is almost brown. Is it possible to change the colors or intensity of this design?