What's the best brow powder or pencil for blond brows?

Some medication that I'm taking is making my brows grow in oddly with most of it still being blond and a few brown ones. There are really too many brown ones to pluck out, so I'm looking for a good powder or pencil to make them look even. I've already tried Benefit's Brow Zing and wasn't impressed, so other suggestions would be lovely.