tri-hex pattern?

I have gotten something similar with the kaleidoscope and I will see if I can reproduce it again.

The above pattern is horizontally symmetrical, so you really just need one half of it and mirror the other half.

No, I didn't. In FF I would probably approach it with mirrored profile gradients in 0, 60 and 120 degree angles and some rather complicated masking. When I look at that pattern, I see gradients in 6 directions or mirrored gradients in 3 directions and a whole lot of masking. Then you should be able to repeat it with an Integer Slider control that changes the Repeat factor of the gradients (and masks). Theoretically, that is.

In order to tile the pattern seamlessly, you will have to fit something like 4 horizontally and 5 vertically into a square area. (Unless you make your original image the same proportions as a single tile.)