As I work slowly away on Moths vs Butterflies, here are some reference images from a series of Google Image searches using the colour filters (which are rather clever).
While the logic is that the forest will be primarily green, the idea of having sections of colour in their world is very appealing and might allow for a more complex story or side 'quests' to have a stage that sets them apart from the main storyline. Here are a few images to highlight the importance of the forest itself, it is a character in the world as much as the Moths and Butterflies are:
[forest reference image : http://www.fwallpapers.net/pics/nature/forest/forest_29.jpg]
[forest reference image : http://www.flickr.com/photos/zebandrews/3731689470/sizes/l/in/photostream/]
[forest reference image : http://3.bp.blogspot.com/_WAmkB7basH4/TCI_RJxGx3I/AAAAAAAAACk/W_UyEDgdDP8/s1600/Autumn_Forest_in_the_Sun.jpg]
[forest reference image : http://www.naturewalls.org/wp-content/uploads/2010/05/dense_forest_wallpaper_1.jpg]
[forest reference image : http://www.reephamhouse.co.uk/images/photo%20forest%201.jpg]
Here are a couple of concept art pieces as well, these artists do a great job of drawing out the essences of the places they envisage.
[forest reference image : http://i39.photobucket.com/albums/e200/cassiedra/night_forest_castle.jpg]
[forest reference image : http://community.ageofconan.com/conan/frontend/files/CONTENT/jungle.jpg]