Just make your own textures. I do a lot of photographing trees, then in photoshop there's a filter; shift. If you set that to half the pixel width and height (you need an even width and height), you get a 'cross' of overlap in the center. There you clone towards a smooth transition and (if necessary) shift again until it's in orginal view again. Then use Pixplant to make a displacement map, in Photoshop set it greyscale (lesser Mb's). But there are other ways also.