New contemporary painting: Yago Hortal Painting style - drop splashes of paint then drag brush through it. This is gorgeous. I won't have brushed big enough to do this, but you could pick up a giant sponge brush at the craft store for pretty cheap
Like the idea of a library without walls :-) GB Bookyard, built by Massimo Bartolini for the Belgian art festival TRACK: A Contemporary City Conversation in Ghent. Visitors may browse and choose whatever book they like for a small donation.