Sean,
If you want to have more brows, you can use minoxidil (sp?) the same stuff men use to stop hair from falling and grow some back. Use it with a q-tip, so that you only apply it on the brow area. In less than a month you should see results and your brows will be 'bushier'. But use it with a q-tip, you don't want to look like Omar Shariff!
As for the idea Alex gave you, it's good, but MAC makes eyebrow gels with color. I personally use the clear one, but there is a light brown (taupe type of color) and a darker one as well.
You can also dye the brows, but use a product especially made for lashes and brows (I have a pro product, but not with me right now. Bare with me and I'll get you the name). DON'T get the stuff they sell at Boots, it makes hair look grey instead of really dying them.
HTH,
Sofia