So when at uni I'll be wanting to decorate the walls with some pictures or posters and whatnot, but of course in halls you aren't allowed to use anything that'll damage the walls... Is there anything you can use that won't cause any damage?
Blu-tack usually leaves a greasy mark where it was anyway, even if it doesn't pull off the paint.
Gripping Stuff is really good... http://www.grippingstuff.com/Shop/section.php?xSec=12
You can cut it to the size you want and you only need a little bit in each corner still. It doesn't leave any marks and only took off two tiny spots of paint where I had stuck things pretty much all over the wall.
The Uni I'm going to provides us with a notice board kind of thing in our room to pin posters, photos etc on. They don't let you use blue-tac to stick things on walls which seems a bit harsh to me but oh well
Every uni pretty much says no blue tack, but the room is not brand new 95% of the time. There will be greasy marks on the walls and bits of paint missing from where previous occupants have stuck their posters. How are they supposed to know who's marks are who's?