Finding it difficult to come up with a ruleset that takes a solid block and fills it with a repeating fill of tiles:

There are times with tilesets where you have larger tile 'blocks' that you want repeated?

[1,1,1,1]            [1,2,1,2]
[1,1,1,1]   =>   [2,1,2,1]
[1,1,1,1]            [1,2,1,2]

Was bummed, seemed like the kind of thing that would be possible with a rule based system.  But maybe i'm not doing it right?

Thanks!

You could try something like this (right click and save).

Oh wow, let me see how you set it up