I made these two lovely magnets from the Girl with Dandelion Dress and In the Flower Mountain Paintings. Each magnet is a square of 2" x 2"/5 x 5cm. It is 0.4"/1 cm thick.
They are like ACEO (Art Cards, Editions and Originals). But they can be stick to an iron surface such as fridges. If you like to collect ACEOs, it is a good idea to buy the magnets as well.