This is shader that going to look watercolor shader by using blender internal & v2.6x.
Useful for NPR. Have fun! :D
Your shader is quite effective. I used it as-is on @Jeff2207's Mother Dino.
I appended the dino into your blend, scaled and moved the plane up to touch his feet and angled the camera. I used the teapot material. I thought the colouring would suit the dino and it does. Then I moved the lamp up quite a distance away and focussed it fully on to the dino and rendered. I duplicated the lamp and hid the original, moving the second one closer and rendered. I repeated this four more times, either moving the lamp closer or strengthening its power. Comparing the renders, there is a sweet spot where it is just close enough and powerful enough to give a nice strong colour, but either side of that, the effect is too weak or too patchy.
Thanks for sharing!
Very cool. :)