If any of you are in Columbia Road this weekend, there's a little exhibition on of home-made/customised sleeves. Can't recall the number, but it's about 5 doors to the right of The Royal Oak, slap bang in the middle of where the flower market is.
It's very lo-fi, sleeves drawn on with biro, made out of record store bags and magazine covers, Beatles faces stuck on labels, but is pretty cute in it's own way. it's very small - about 50 or so sleeves in total - but worth having a peek if you are in the area. The chap who organised it has been collecting them for a while and has a small chapbook out.