Alrighty, since I have WAY too much time on my hands on Saturdays and Sundays, I got to work on Bolderdash. Yup.
As you can tell, Rebble gets rougher as it evolves. Starts off as a lightly colored Pebble, then evolves into a darker, rugged Boulder, and then evolves into the dark and rough awesomeness that is Stratagem. The big jump in coloration from Bolderdash to Stratagem is due to the fact that Stratagem gains A LOT of new gems and minerals upon evolution. NOTE: I didn't make the Stratagem sprite, in case anyone thinks that.
So, any C&C?
Edit: I'm fixing red hues on the rocks in back, hold on...
Edit 2: Alright, fixed the hues.