Free gold or brass clockwork background. Here is another texture with cogs and gears at multiple levels, being seamless limited what I could do in the final. My thinking is to make a final image by tiling a few copies together, then adding some grunge and a vignette to darken it a bit and get a nice steampunk feel.
Edit: After writing that I thought Why not? and went and did it! Here they are Two steam-punk styled backgrounds