CREATE YOUR OWN SEAMLESS PATTERNS
A great way to create seamless vector graphics is by using the Pattern Options in illustrator, as it has some really cool and easy-to-use features that allows you to create great visuals. You can play with the grid, spacing and orientation of your shapes, and also get a good sense of what it would translate into as a seamless and repetitive pattern. Once you have finished creating your pattern, you will find it in the swatches window, allowing you to fill any shape with your pattern. Just draw a box and fill your shape with your pattern, and export it as a black-and-white map that you can start using back in 3ds Max.