Hello,
there my best nude lip but they are not really nude lip, these colors give some color on lips (i hope that's clear ^^)
In MAC
Lipstick : VivaGlam V, Tempt me, Midmauve
Lustreglass : Ornamental (sheer colour in reality, really pop my face)
Lipglass : Enchantress
In Urban Decay
Firecracker in Pen (cheapper and better than Stila)
XXX shine gloss in Carney, Quickie ...
XXX mini pot : wicked, sin, ...
Burt's bee colored labello.
I love makeup'eyes so i prefer when my lips are more soft ^^
Real "nude lip", put foundation or concealer on mouth, then put on clear gloss, if you're not look dead, and voilà, les vraies lèvres nues