[lonemadmax]

Unfortunately, I don’t have a place to show it. You can download and install, *your forum will keep its functionality*, just with an optional annoying box reminding you that you can test themes. And only if you install that part.

Also, a few things I failed to mention: it’s ugly (I just wanted it to work and I’m not a designer, anyway), it expects nice theme names, the box only appears in the pages that use bb_get_header and the template’s header file is supposed to not finish in the middle of a tag (the middle of the tag itself, not its content, of course). Those don’t seem to be great assumptions, even though I’ve only tested it with two themes.