So I was just curious:

I am new to Deadpool. In looking to start a collection I have seen a LOT of Deadpool/Iron Man variant covers. Is it just cool for the artists to draw that kind of thing, or do Wade Wilson and Tony Stark have an elaborate past that I haven't gotten to yet?

Spoilers are okay (with me), I enjoy reading them, however I've no desire to have my mind blown with unexpected twists.