Do you know these really well-made magazines about street art and graphic design? My friends from Gee.Oh.Dee made a whole collection and each issue has a particular topic. The magazines and books include artwork of all the famous recent artists and you probably will find tags, paintings or logos you might have seen on a CD cover or party flyer before. So if you are looking for any special design, go get one of these, you will find it for sure.
PS: They were also the promoter of the unforgettable festival Decibelio, which took place in Madrid/Spain in 2005 and 2006. Plus, they are audio and visual artists.