Get some old cardboard boxes. Cut out the main panels.
Draw out a pattern or picture of your choice with pencil.
Using PVA glue paste down the wool on top of your pattern. (Don't be afraid to use lots of glue!)
Leave this to dry overnight.
Cut out a large piece of tin foil slightly larger than the piece of card you've been working on.
Loosely place it down on top of the card. Press it down into the corners.
Colour with markers! (Sharpies work best!)