how to find a matching tile
We have some tiles we like to replace because some of them are chipped and has mold on them. but we do not plan to replace all the tiles (because it requires to replace the door for the shower). The tile size is not common. One tile is 14.5x14.5cm, it looks like http://www.stonetiledepot.com/product_details.aspx?pid=1912, the other tile we want to replace is 3x3cm, it looks like http://www.stonetiledepot.com/product_details.aspx?pid=1662. How do I find the matching tiles with these "non-standard" size?