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I just wanted to post this as a follow up the Eric Chappell's tips on using Multi-Scale Textures in InfraWorks 360.
One very important component in getting your multi-scale textures to look good is that you have a seamlessly tiling texture, where the edges blend into each other perfectly. Here is a trick that I use to create them. It requires Photoshop, but many other image editing applications have the same functionality.
A few additional pointers:
If you have any questions, feel free to post them in the forums!