Natural Bug Repellents?

I'm repelled myself by the look and smell of most insect repellents you might apply before going for a hike. On EarthEasy.com, I found a "recipe" for a long lasting (5-6) hour bug repellent. You mix one part garlic juice with five parts water and spray it lightly on exposed skin.

Do you have any natural repellents that you buy or make yourself that you can suggest to us?