good call Steen nice price too
Make a simple wooden frame (or get one of your friends to do it for you) it doesnt have to be anything fancy.
Just a bit of 4x1" screwed at the corners with some sort of wooden triangle bracket on the back so the frame stays sqaure.
slap some picture frame hooks on the back.
Nail or screw fitting in the wall and hang it up you should have some nice braodband absorbers.
theres loads of examples of how to make on you tube or even in the studio build section here.
have fun Ollie