The changes I made from the black icons to the color icons were very small and no changes at all. The main change I made was in the icon with the cards. To follow my theme and rules through out my icons i wanted there to be more grey than navy blue, because the navy was so dark and strong. So I took away the outline on the cards and made it white which goes together better with the rest since none of the other ones are outlined. Made the cards grey and also added another smaller heart in the right hand corner. I also made sure I edges and curves were consistent from the color to the black by going back and correcting the original black icons when needed. The original cards were kept in the black icons because the new rule simply wouldn't allow it to work. There is now a nice comparison between the change, showing my process.