I like the idea. I personally think you could do a good range of Beast pics if you do a Beast themed AVATAR. The last Airbender to go with your colour themes (Red - Firebending, Green - Earthbending, Blue - Waterbending & White - Airbending).
As for your Gray colour theme...I suppose you could do an old fashioned black/white pic based from a classic 30's poster or something.
Hope my comments inspire or at least give you something to work on.

Air? thanks, i will used it. Maybe, for gray. I want stay white for snow.

I would really love to see a picture that could go with my last story....but I would feel obligated to pay you something if you did that. Example: The scene where Beast is kneeling on one knee in front of Kenai, in his blue formal clothing, holding the rose in front of his eyes, asking him to rule beside him. :) So romantic, and so stirring.... Plus, you could add tons of fur effects to both Kenai and Beast. Or, just a simple image of them holding each other close? :) Just ideas.

Oh, i think about that sene before :) Not need any pay.
Thanks again for great fanfic.

blue?

~QWTB

Of course

can't wait to see.

~QWTB

Dark Beast plus some bloody muzzle would be great.
Try to make something you love into something really scare XD

I like them all and I am sure you come up with better ideas than I could.