I cut up some cereal boxes for the backing of the jigsaws, and got out our picture collage basket, some glue and some felt pens. Harry had a lot of fun gluing the pictures down onto the cardboard, and we added a few extra details using our felt pens.
We made up four pictures:
Then I covered each one with clear sticky backed plastic to make it more sturdy (I should buy shares in the stuff I get through so much!)
Then I cut them up into different shapes. I discovered that the simpler the better as they can be a bit fiddly when they don't stick together very well and they tend to slip about.
You could also use larger pictures from magazines, greetings cards, family photographs, spare artwork, a letter, a secret message to a family member...there are endless possibilities!