Fun With Tiles #2
This was done using Gimp 2.2.
Symmetrical Seamless Tiles
Symmetrical seamless tiles are tiles where you can't tell where the edge of the tile image is, when you look at it on the desktop, and this is achieved by making it completely symmetrical.
Use the "Make Seamless" filter to make the image seamless.
Filters -> Map -> Make Seamless
Sometimes this filter works well, sometimes this doesn't.
This uses the Mirror Split Plugin to create a tile which is a two-way reflection of one quarter of the image.
Filter -> Distorts -> MirrorSplit
Apply the filter twice, once to get one reflection, and then again, in the opposite direction, to get two. That is, if, for example, you reflected the Right half of the image, then the second time, reflect either the Upper or Lower half of the image.
This takes reflection one step further, by applying a Kaleidoscope effect. There are a few different Kaleidoscope plugins for gimp; not all of them work with every version.
But if you can get one to work, it is really a lot of fun!