I've always been one to stick to "Canon" pony designs. You know, the pastel colors, no blood or gore, etc. But recently I sort of has inspiration for other worldly ponies, like phantoms or glass ponies. Thanks Supernatural.
I previously posted "Ice Beam" as a Crystal pony, but after many people pointed out that there were no "unicorn" crystal ponies, I decided to make her a glass pony.
As for Entity, I was inspired by multiple images, and put them together into one design.
Both initial base designs were created with the Pony Maker.