3M wall stickers.

this site will help u.

i use this when i rent in the UK. my landlord was pretty anal about wall damage and stuff. so i bought a whole bunch of these stickers. they can take quite a lot of weight (especially if u use a series of them). and they dont damage the walls or ur items.

after use, all u need to do is pull the flap on the sticker downwards (parallel to the wall). the entire sticker will come off without a mark on the wall.