A good lash serum such as the popular RevitaLash VLuminé Lash Serum, $85, can help your actual lashes grow longer -- which will make your subsequent mascara application even more dramatic.
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.