I like puzzles with their particular forms.
When I was pregnant with Stella, I did this “artwork”, which ended up in the twin´s room. It is a white canvas on which I glued pieces of two jigsaws. I bought the jigssaws purposely for this and chose them because of their colors and because I like Rizzi. You only need a canvas of the size you like, puzzle pieces, glue and you can start… It is also a great recycling idea to repurpose old or incomplete jigsaws.
I liked to do it and I also like it hang on the wall where the bunk bed pf the twins is.
Another idea to decorate a kid´s room is to do the letters of your kids and glue them to the wall or you can make an alphabet out of HAMA perler beads. Another idea is a blackboard wall in any room of your home (you could paint the wall directly with chalkboard paint or use it on wood or canvas).
The result: ingenious and economic way to decorate your kid´s room.