I have a couple I recently discovered that I love.
This first one is Bella topped with Excite. This is super pretty because Bella is so cool, but Excite is warm. So you get a neat color, the cool in Bella also makes my teeth look whiter, but the gold of Excite really warms up Bella so it doesn't look too cool.

This one is my favorite nude lip, but it's a bit complex. I start with Bella applied lightly and top with Nice Tan. This makes a nice cool nude. Then I top with Excite. It ends up being a color that is not too cool and not too warm, but really complex and pretty.

And last but not least, Gigi topped with Icing. A very bold and bright lip!

What are your favorite combinations to do?