I had the surprising opportunity to do the commemorative poster for Lollapalooza 2010. The design was based on posters for the 1893 Columbian Exposition for the classical and epic feel.
This one is not a screenprint, as it's a full-color painting (done in Photoshop). Instead it's a 4-color offset print with some spot metallic in the large type, printed on matte paper. And it looks really good if you don't mind my mentioning.