Custom sets?

So, I just came across your wonderful program yesterday;
So far I really enjoy it.
I was wondering; is there a way I can make a custom set, just comprised of cards from other sets? How would I do that?
When the multiplayer is up and going; I'd like it if everyone at least still sees the default art for the card; but ideally, they would get sent the alternate art from me (prompt for download, maybe); and in the case of a conflict (say, because they have an old version) they would have the option to say no.
Basically I just want to do up a bunch of fancy renders for my EDH decks.
So far I really enjoy it.
I was wondering; is there a way I can make a custom set, just comprised of cards from other sets? How would I do that?
When the multiplayer is up and going; I'd like it if everyone at least still sees the default art for the card; but ideally, they would get sent the alternate art from me (prompt for download, maybe); and in the case of a conflict (say, because they have an old version) they would have the option to say no.
Basically I just want to do up a bunch of fancy renders for my EDH decks.