I think it was Geeboss who came up with the idea of wrapping an old cut-down bamboo curtain around his EarthTainers to shield them from the Sun. You can also take 2 ft. wide redwood lattice panels and make a 3-sided hinged panel to surround the 3 sides most exposed to the Sun.
The dual-wall EarthTainer III design will minimize heating of the Grow Media much better than the prior design, so having to use a darker color container now will not be as much of a problem as it was with the old design.
Some "visual" ideas done by others:
Raybo