A true no brainer to every Unity mobile game developer, Bitmap2Material 2.1 is an incredibly powerful filter that can help you generate full, high quality, seamless tiling materials (normal, height, specular, ambient occlusion, etc.) from any bitmap right within Unity!
Not only is B2M a very useful, creative piece of software, but it is also a great and simple tool to make your game smaller: with B2M, you only embed the input diffuse, the other maps such as normal, specular, ambient occlusion, etc. are generated at install or run time, leading to huge space savings.