These magnetic poster frames from MOXON are the easiest frames I've ever used. You simply lay your print/poster on the back part, and pop the front of the frame on top. Then it's ready to hang!
They come in three sizes: S(A3) 32cm, M(A2) 44cm, L A1) 62cm and three colours plywood, black and white.
These are a cost-effective and very quick way to get your artist print up on your wall and transform your space.