MoustART.

By The Vintage Sister.

Mr. Moustache.

By Studio Violet.

Fancy moustache.

By Neal Levin. More illustrations here.

Mr. Pernickety

From Mr. Men.

Mexican Moustaches

By Cosmas Minimas.

Cocktail moustache

From Skinnyships/Richard Perez

M is for Moustache

From Dpsullivan.

Secret stache.