Having been looking for displays/posters to put up in my new classroom I came across the following website...
The site is an extension of a site that I have used in the past www.amathsdictionaryforkids.com and there are loads of great posters free to print from the website.
Having been in and seen my classroom in the week I found that I already have a piece of string (with pegs) that goes from one side of the room to the other. There is currently nothing on the string and so I have decided to laminate some of the posters from this site back to back so they can be seen from both sides of the class (front and back)!
I would highly recommend checking the site out if you need some displays!