Use Eyeliner as Lipliner
Chances are that the eyeliners you own come in darker colors than your lipliners. (For instance: everyone has a black eyeliner, but not everyone owns an onyx lipstick). You can sometimes use those eye shades on your lips. In fact, the regulations of pigments for eye makeup are just as strict as those for lipliners, and the two products use pretty much the same ingredients. That said, you should still read the ingredients carefully before trying this and not use lipliners on your eyes because the color additives used to create those pigments are not totally eye safe.
Start with a black or deep brown eyeliner, like Anastasia Beverly Hills Waterproof Crème Color ($18), and shade around your lip. Then, fill the inside of your lip. Next, take your desired lipstick shade and apply it on top. Use your lipliner brush to blend the colors together as you did with that hack we just mentioned.