Celestia turned out the most out-therish so far.

Changed up the mane to match Luna's, but also to be kinda opposite to her's (Luna's cold, Celestia's warm) and made it more 'Sun' colored. But I still wanted to use her original mane colors, so I used them for the feather parts.

Animals that loosly inspirited parts of the design: Vigors's Sunbird, Peacock for the 'bird' parts and Calico Horse for the coat.

I may revisit this design in the future. As I feel like it may need some slight adjustment.