I didn't purge enough material on some of the colors (white/black to red), but overall I'm happy with the outcome.
Red - Protopasta Opaque Red
Blue - Atomic filament royal blue
White - Atomic filament bright white
Black - Atomic filament jet black
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It's been a while since I set it up, but I think this was all of the changes. I did these mods while I was setting up and it was never fiddly for me like it is for a lot of folks.
PTFE clip: http://www.thingiverse.com/thing:3587022
Opened up selector: https://www.printables.com/model/103029-mmu2s-selector-with-mods-remixed-to-refine-filamen
RMU inspired buffer: https://www.printables.com/model/77054-mmu2s-buffer-inspired-by-rmu-buffer
PTFE coupler: https://www.printables.com/model/6605-prusa-mmu2-ptfe-holder-m10-passthrough-adapter
Larger PTFE tubing (3mm ID)