It's always a great idea to have a sheer, shimmery gold lip gloss handy. Apply over your favorite daytime lipstick or lip liner and suddenly you're fab! For best results, look for a shade of gold that's on the yellow side. Remember that you're mixing it with another lip color; too subtle of a gold and it will look muddy. Look for something shimmery, but not glittery. You want your lips to look wet and light-catching, not ornate and circus-y!
I'm a big fan of YSL's Golden Gloss in Simply Gold ($30).