This is just a really simple chain brush. I needed one for a painting I did, so I thought I'd put it up here along with a brief tutorial. It's a pretty big brush (345 pixels), so it works quite well for heavy chains as well as necklaces. Feel free to use it however you like, so long as it's legal. Credit would be nice, and I'd like to see what you did with it too, so leave a comment!
The .zip file contains the brush itself (.abr) as well as a .png and .psd version of the original image in case the brush doesn't work for your software.
Don't take it and claim it's yours. It's free to use for personal and commercial work, but it's illegal to take it without crediting me.