My 4yo ds enjoys geometric math exploration using flannel board shapes. The "board" is just a piece of cardboard with a piece of flannel material affixed to the front. The one above was attached with a zigzag stitch on a sewing machine.
The shapes, cut from felt, were made with patterns from the shape set from Box It or Bag It. When ds first starting constructing, he made a lot of abstract "fill the board" pictures. Then he moved on to making "pizzas" and feeding me his pizza board. ;) Now he's arrived at building vehicles and structures.
You could easily make a set like this for an inexpensive, educational holiday gift. I found felt at garage sales, received some as donations from friends, or purchased it
If you do this, comment with a link to your photo! ;)
This would make a great preschool workbox! :)