Hello Everyone !!!

First post ever, so I hope I'm posting this in the right topic. Anyway, I'm a beginner and I have to idea if what I'm trying to achieve can be done or not, so maybe you guys can help me out a bit.

I had this idea for a wallpaper that should be nammed "Casting Call" or something close to that. Basically, it's a bunch of picture (polaroids or folders) of famous people displayed on a table. I know...it's kinda amateurish, but it seemed like a good project for a beginner like myself. So anyway, there are three things I'd like to add to that. Remember, we're talking about a wallpaper here, so I have no idea if this can be done;

1) The first thing I had in mind was to make it fully customizable. Let's say I can fit about 20 polaroids on that table. Would it be possible to make it fully customizable, so that other people could chose which celebrities would be displayed ? Like if I had 100 different polaroids (all the same size) and that, in the menu, the user could select the personalities they want by checking a box in the menu ?

2) I once worked with a javascript that changed the oppacity of a picture on mouse-over. Is that something that can be added to a wallpaper in any way ?

3) I also worked with another javascript that would flip a picture over so that you can see the back. I guess it's question 2.1 really...can that be use ?

Thanks to anyone willing to help...