I made all the textures for the wood and stone from taking photos of wooden surfaces and stones from around our home in the real world. All modeled in Seamless3d but much of it was made the same way you would in a voxel based building game such as Minecraft or Portal Knights. With a kit of simple pre made textured blocks, it should be free, fun and easy for anyone to build themselves a house with the upcoming version of Seamless3d.
The textures for the wood grain and stones look much better in high res which you can see on the gallery:
http://www.seamless3d.com/gallery/page6.html