I'll always be a fan of Dramione. Seriously, the whole "inter-house unity" bit throughout the books and umm. you don't get a major character pairing between Slytherin and Gryffindor? I do love Ron and Hermione though.
This is probably one of my favorite prints. It is simply beautiful and as a hard core Snape fan, slightly heart breaking. I thinks the symmetry and yet asymmetry really helps illustrate their relation ship. Plus you gotta love the Art Nouveau vibe.