Creating a theme gallery

One of my favorite things to do is to look at WordPress themes. There are so many cool ones out there. It occurred to me that I’d like to create a place where I could show the ones I liked the best, a gallery if you will. I’m not sure exactly how to go about doing this though. Is there a plugin that might do this already? I’d like it to be a page, i.e. mysite.com/wpgallery, though I suppose I could make it a standalone site. I’d like to have a thumbnail of the theme and a link to the author and where to download it. Anyone seen this around? Have any thoughts/ideas/suggestions? Thanks for your help.

P.S. I assume that by linking everything back to the authors I’d be fine but to be safe I’ll probably email them as well. Any reason why an author might object to something like this?