This may well be common knowledge but I thought I might as well post as it could help someone
Did you know you can often get free samples of fabric (usually about A5) and wallpaper (usually A5-A4) from online wallpaper/curtain shops?
I've just spent an hour ordering samples from about 15 different sites and haven't spent a penny! I think I went slightly overboard 
Even small pieces of wallpaper and fabrics can be used in loads of different craft projects.
I just googled "free wallpaper samples uk" and you can usually order 2-8 samples per site - have fun choosing patterns and colours!