Last week I bought an interesting product from Urban Decay- clear lip liner!
It works great as a reverse lip liner- I line just outside my lips to prevent bold lipstick from feathering. It also works well as a regular lip liner, when I don't want to add any color under my lipstick.
I tried to swatch it, but it's completely clear so it didn't show up at all!
Would you ever buy a clear lip liner?