I'm trying to make a shading network for a character....

At the moment, I've made a bump node that's connected to a lambert. The lambert is has a colour assigned to it (blue)

I want to make an attribute that's on a character's control curve - and when I change the value on the control curve, the colour changes to one I pre-defined.

My question is how can I make the colour change to three different options?

I want to use the blue's HSV values and have two other options for colour.

Any ideas?

Thanks

James