Seth Engstrom created some of the concept artwork for the blockbuster Avatar, a film which Rotten Tomatoes calls, accurately in my opinion, "more impressive on a technical level than as a piece of storytelling", but that aside...
The film is set in the fictional world of Pandora, most of which covered in lush rainforest. I spent a majority of the film just admiring the scenery, for obvious reasons.
This final image is of particular interest to me. It is the "Tree of Voices", named so as the voices of ancestors can be heard through their branches. The scenery here takes our traditional understanding of a forest, and combines it with these magical and wonderful fluorescent, crystalline colours, which show the special and spiritual nature of the tree.
Similarly, my character's environment will be infected with otherworldly magic that will cause vibrant, contrasting colours to be spread around an otherwise dark, gloomy area.