How to make a seamless texture?

[OddLlama]

I can make textures (grass, rock, etc.) purely out of renders/effects, meaning that I can make them as big as I want. How would I go about making these textures seamless?

 

Edit: yay I found how

Edited December 22, 2012 by OddLlama

[BoltBait]

Here are a couple of plugins you can try:

 

http://forums.getpaint.net/index.php?/topic/4591-seamless-texture-maker-ymd100718

 

and

 

http://forums.getpaint.net/index.php?/topic/2244-seamless-texture-helper-plugin

[OddLlama]

The problem with the first one is that it creates unrealistic symmetry in textures like rock.
The problem with the second one is that it's for objects.

[OddLlama]

Oh, I seem to have found a way.

It requires brushes, but I think I could make it work without them. I'm going to edit it into my original post to help future readers.