What do you mean set it to tile? i do not know too much about photoshop.
Not talking about Photoshop.
I'm assuming that Mac isn't the only computer good enough to have this feature?
Also, I made the studs 26x26 based on the size of the studs in your image. If you want them in another size, just ask. The actual images for the studs that Blockland uses are 512x512.