Although at first I was hesitant, because they looked kind of messy, I am completely in love with Cheek and Lip Stains. They are so sheer and natural looking, you almost don't need any other makeup. Great for Summer and Early Fall!
Here are a couple of my favorites:
Benetint Cheek and Lip Flush - Celebrating thirty years of fame, this is the creme of the crop and one of the originals. It's available for $28, here
The Balm Stainiac - I like this one because of the lipgloss-like applicator. It also comes in three different colors, which is nice. Available for $14, here