Post on my blog about an easy way to make tiled wall sets.

You can see the article here: http://louardongames.blogspot.com/2012/02/so-you-want-to-make-wall-tiles.html

I explain how the walls were done in Babo:Invasion as well as an upcoming NorthernBytes game. This technique can dramatically cut down on the workload of creating tileable walls that work into each other.