The ability to change the material of not only just text bricks, but also tracks would allow for more creativity when building creations. For instance the chrome lettering on cars, or the duller lettering on a piece of paper. This could also go into having glowing text too, as it would be much easier this way to have glowing text by selecting the glow material as the text material, rather than chrome or rubber or another material as such. And with tracks, this could allow for the creation of stuff such as fully rubber tracks, steel/aluminum tracks, or the creative ability for stuff not implemented in the real world such as foam or glowing tracks. This would also allow people to material match their tracks with their creations, making them look better as a whole, if the creator of the creation desires. Overall I think this would be a wonderful addition to the game.