If fancy lash serums aren't quite your thing, you can always try applying plain ol' castor oil to your lashes. It's actually a popular natural treatment for both eyelashes and brows, since it both conditions and promotes hair growth.
Have you ever thought about adding a touch of glitter to your mascara? Stirring in a bit of cosmetic-grade glitter in can add an unexpected and fun touch to your favorite eye look. Try M.A.C. Glitter, $22, in 3D Black for a subtle glimmer.