Ages ago I saw some cool cassette tape art similar to this at the Saatchi Gallery. If I remember correctly it was done by a student and it had a really poor position in the gallery which was a shame because I thought it was great.

These are by an artist by Nick Gentry using floppy disks as well as cassette tapes. Truly awesome stuff, I love it! See more by clicking on one of the pictures, or here.