When you hold an icon and let go to get to the icon changing screen, once there hit the menu key and you'll have the option to switch between basic and marshmallow icons. This way you can use the two sets for individual icons 1 at a time, I actually like the icons using choices from both sets like the basic camera and the marshmallow message ones lol. Guess I'll add some pngs to my gallery and customize even more.
LG Optimus G (Sold) Galaxy S4 (Buyer's remorse) HTC ONE (Buyer's remorse) LG G2 (Loved it for a week) Note 3 (Couldn't help myself) T-Mobile
My Note 3 is powered by Darthstalker Rom and LeanKernel (Happy Happy Joy Joy!) 38,378 Antutu