I'm actually pretty happy with how this one turned out. The colors worked well, for a single-layer image.
Magnification 1.8161869x1035. It took a stupid amount of deep-zooming to get the diamonds to be even slightly the right shape, and thus the render was probably the slowest of the whole bunch.
I made some Purple Horseshoes, but they looked only slightly like horseshoes, and a lot more like the cross-section of some mutant purple celery, so I probably won't post them.