I take photographs and break them into segments for 4", 6", and 12" ceramic and porcelain tiles, making one whole complete picture from several tiles. For several years now, I have just managed to create grids and guidelines and crop my images piece by piece.What I would like to have for GIMP, is a script or plug-in that allows me to take any image, run the script/plug-in based on the tile size (2", 4", 6", and 12"), distance between tiles (1/8", 1/4", 1/2"), and number of tiles to be used, automatically setting up layers for each tile image for printing. My current method involves me setting up the guidelines determined by the variables above, using the rectangle tool to crop out the images, one by one. I am sure there is an easier way to do this, but with so many scripts available to me for creating layers, etc, it gets so easy to get "lost" in the process of what I am trying to accomplish.
A visual cue of what I am referring to is similar to this instructable image I found on the web: