Yeah, I'm just thinking for identification. I don't want different colors on my cartos in any real obvious way. At all. I'm just thinking it'd be nice to see at a glance what was menthol, what was 'baccy, and what was some other oddball flavor. So for me, I'd like to see green, brown, and white either in the writing, a thin band, or the end cap or even the condom like Maurice suggested (although I feel like that is prone to user error). That way when I'm carrying around 3 different flavors of carto it's easy for me to pick out which is which without straining to read labels, or in the case of refillers, guessing blind.