There was a good thread the other day with lots of different design wall ideas.
I started with the tablecloth and found it didn't have a lot of stick!
Then flannelette taped to the wall with painters tape.
Graduated to fleece.
I now have a deluxe permanent one ... black fleece on tentest sheeting screwed to the wall. 7-1/2ftx10ft. Bliss!!! :)