Yup, for magnets I generally use the matte glazed floor tiles. You can used the tumbled too, it's just a different look. Make sure you seal them if using watercolor pencils, chalks, etc. I use a round magnet that is 1" in diameter and 1/8" thick which I hotglue on the back. The magnet is overkill if your goal is just to hold the magnet to the surface, but I like to use my magnets to hold junk on the fridge and can't stand it when they start sliding down the front of the fridge. KWIM? I can hold several sheets of paper on the fridge with no problem!
You might also try searching for more advice on the tiles. The topic comes up frequently and the ladies always have tons of great advice!
