This is a great idea, especially if more people consider making .xpr files to post their themes. Someone please correct me if I'm wrong here, but other than using copyrighted images, there is nothing illegal about having a server that would host these themes is there? I don't have enough time today (Sunday), but I'm off tomorrow. If no one manages to script a "Download Themes" option, I'll take a look at scripting it myself. I'd much rather attempt it in .xml format since it would be a simple addition to the skins .xml files and I haven't messed with python scripting all that much.
For creating your own themes, you can check out
this post to make your images in to an .xpr file. Now we just need to figure out a way to host them (IMG:
style_emoticons/default/tongue.gif)