These were shrines leveled up as you collected dragons of each element. I created them in Maya and ZBrush, rendered them with lots of different materials in ZBrush, and then composited and painted on them in Photoshop. they're not as flat as the first pass on them was, but by the time of this revision, devices were larger and higher resolution, and the art in the game had shifted a bit.
Some of these are based on concept art by Jerry Meyer, some I designed.