Currently, when you mouse over an ingredient at a building site, it highlights the aspect of the building that it will affect the texture/color for. It would be fantastic if you took it a step further so that when mousing over while holding an allowable ingredient it gave a preview of the actual color that ingredient would apply.
Example for clarity:
1. Place a building site for a log cabin.
2. Pick up a piece of straw and hold it in your cursor.
3. Mouse-over the thatching material 0/20.
Result: Preview of the log cabin would show the yellow straw roof texture/color.