I'm here to suggest tints/transparent color overlays for our lions.

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Why?
Because a lot of the backgrounds are colored a certain way that make lions stand out almost painfully. The most glaring examples for that are the nighttime backgrounds - where your lion is bright as if it is lighted up by some magical source since no lightsource is visible. A blue tint decor would solve this 'problem'.
Other Backgrounds depict setting suns - an orange tint would halp your lion look like it actually was standing in the sundown.
Or the
Misty hills background which would work lovely with a yellowish tint - making your lion look like it stands in the dusty mist rolling along the hills.

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How?
It would be a very easy thing to do. Basically its nothing more than a semitransparent overlay fitting over every lions form. There could be a dynamic one too - changing with a corresponding set of backgrounds in their day night cycle.

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Problems?
Well not any I could think off. Feel free to add any you find?
Only thing comming to mind could be that other players might get confused about 'new colors' - but the same would be true for many other decors that in one way or another change a lions appearance (custom manes etc.).

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Additional bonus?
Your Maltese lion not blue enough? Want to get a deeper red into your maroon or fiery lady? Well if you use the tint decors you might color your lions in special and stunning ways - make those rainbow colored lions look more natural or pep up your NCLs with some fancy colors.