Line the top lashes and then wing it out just a bit. You can wing it out further for a more dramatic look.
Or wear false lashes on the top only.
You can also apply liner on the bottom waterline (inner rim). That closes your eyes in to enhance the effect.
Lastly, and this is tougher to do, you can create a false bottom lashline by, instead of following your lashes, drawing the line where/how you
want it to look then use whitish e/s to "fill in" the space. Yes, it's a dramatic look, but if you're daring...
I'll look for a YT vid to show you how.
Edit: Here are 2 vids...They are meant to be super-dramatic, but they're just to show you what I mean. You don't have to do it as dramatically as they did.
http://www.youtube.com/watch?v=7byaZSpWvcA
http://www.youtube.com/watch?v=H7Jlc9bJMJg