Reddit reviews White Marble 1" Hexagon HONED Mosaic Tile Meshed on 12x12 sheet

They come in this size and shape, but adhered to a 1 square foot sheet of plastic mesh. http://www.amazon.com/White-Marble-Hexagon-Mosaic-Meshed/dp/B001E36ZOM

Its a giant pain in the arse to clean all the adhesive off of the tiles and separate them from that mesh, but easier i think than manually cutting them.

separating, sanding, and hand painting all the tiles seen in the picture took about 8 hours for both me and my girlfriend (though we messed up several of them and ended up throwing them out). I think we will make more of them to sell, but instead of hand painting every tile we can spray paint them the bulk color, and will hand paint little graphics, scan them in and print stickers. That eliminates at least half of the work. I addition, I've talked to a tile supplier and he seems to think it wouldn't be hard to get a hold of some tiles before polishing and adherence to the plastic mesh, so we could essentially get them ready to paint.