Not exactly a new trend, but it sure is coming back! The duo-tone lips! You can use the basic lipcolors like red-pink, pink-lightpink. But if you're really a fashionable dare devil try firing it up with some bright colors. Orange, purple, blue? Any kind of odd lip color you can find.
Just now I tried the pink-red look.. Don't laugh :P
I used the *Lanvin♥H&M RED & *M.A.C Viva Glam Lady Gaga: C30.