As a Roblox developer, it is currently too hard to create custom materials that do not tile, even with the organic tiling mode.
The organic tiling mode does some magic to create variance in your material to eliminate tiling patterns, however it does not look like this tiling mode involves rotation. This makes sense for materials that have an orientation (e.g. tree bark, or sand), but does not make sense for many other materials (e.g. concrete, grass, dirt).
The lack of this feature creates striped tiling patterns in organic tiling mode materials that can be very difficult to totally eliminate when developing new materials from photographic sources.
