Free for use as long as you give credit so other people can find and use 'em! Pretty sure this is seamless. It looks okay on my computer, at any rate.
Dinosaurs, as suggested by =maytel
Color scheme: [link]
with an additional color for the background so it really pops
I want to work more on being able to have a patterned background, too, instead of a solid color. Slowly but surely, my friends. Slowly but surely.