We used a wardrobe box from Ace Hardware.  Covered it with blue paper using packing tape.  I traced the monkey on white paper from my projector.  We used washable paints to paint George.  After painting we cut him out and used two sided tape to tape to blue paper.  I cut out the clouds with the extra white paper and also taped those to the blue paper.  Last drew cut a door out in the back for kids to step into and a hole for the face.  We had to hold down the box with center blocks so it would not blow away.