Math concepts - beginning tangrams and intro to geometric shapes. Images The first two show the lines whereas the others do not making them much more chalenging.

These were purchased @ a resale shop without the tangram pieces ($13-$25) so I made my own by cutting the shapes of 6 different colored  sheets of foam. You could also add a piece of magnetic tape to the backside and stick them on a dry erase board or cookie sheet or even the fridge. This is a great activity and if you make it fun it could easily turn in to a good leisure activity.