All of your fabrics are very suitable for a OBW. Personally, I'd choose ones that have more colors in them than fewer. Your resulting hex's will be more varied then. Check out my avatar - that's a tropical bird fabric. The Sparklers fabric might turn out to be quite a lot like it originally is, with a quick look, since the print is already an exploding firework. I'd also suggest to use the hinged mirrors to see the possible hexs you might get. Hold it open so you see 6 images in it and slide it slowly along the width of the fabric. You'll be amazed and get so excited of what's to come! Enjoy!