Typically, color changes in figurative origami models are created by unwrapping a flap or a similar procedure. The idea for this model was to create color changed wings for the frog by creating small flaps at the center of the model, and having them poke out of the seam where the edges meet. This creates a color change that is not at the edge of the paper (depending on how you conceptualize it). Very technical, I know. Unfortunately, this model was not well received, and while I am rather fond of it, I also believe that it cannot be viewed from any angle other than the one pictured above without becoming less endearing.
As a side note, while the structure was intended to be a hybrid base, the 22.5 degree lines at the head did not quite align with the 45 degree boxpleating lines. As such, there was some mushing at the transition to get the model to lie flat. If I ever make a redesign, I will most likely fix this.