This picture shows spotted pigment loss mutation. I believe this to be mainly LII but possibly LIII in some cases as it nears the center and LI as it runs off the end of the leaf.
This species has a combination of LI and LII mutations. This mutation is prominent in that you can clearly see that the edges have lost full color pigmentation.
Sara, your first picture is so pretty!
These pigment changes would be due to loss of pigments resulting from the cold weather. The loss may be greater or faster in particular tissues, leading to these patterns. They would be variegation, but not chimeras, and speculation about LI/LII or LIII wouldn't be appropriate.