I recieved a warped 1x8 tile with mine, and I also notice the slight color variation. I think it looks good, as it makes it look more realistic. Rocks don't all look the same color.
-l2k-
I actually changed the wheel hubs to a yellow half technic bushel, which you can get 7 of in the small aquaraiders set. I forgot I had them before I took pictures.
-l2k-
In this contest, the idea is to make a wheeled mecha, an example being
The mecha must be free standing, and have at least 3 legs, each with a wheel. There is no limit to size, and the only rules are it must have an enclosed cockpit and have at LEAST 3 wheeled legs. Ready, set, go!
-l2k-