I've never participated in color challenges, hope I understood it right.
These are my collages made in Photoshop. I like very much the idea of making something 2D alive. By adding lights, shadows, fixing colors etc. to blend with background I feel like a real wizard.
Noire from Hyperdimension Neptunia
Hibiki from Kantai Collection
I could upload more arts, but these ones are my favourites :) I hope you will like them.
Links to used anime arts: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=62985843
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=60123890