Found This on Care2:

A little off track but we don’t want the bugs biting while we are outside enjoying Mother Nature!

Insect Repellent
Here is an easy repellent to make that has a shelf life of around six months. Label jars “mosquito,” “tick,” etc. for quick identification.

10 to 25 drops essential oil
2 tablespoons vegetable oil (olive oil is fine)
1 tablespoon aloe vera gel (optional)

Combine the ingredients in a glass jar. Shake to blend. Dab a few drops on your skin or clothing.

Here are some suggestions for your choice of essential oils:

Bug Repellent Essential Oils 
Caution: Pregnant women should consult with their doctors before using.

Ticks First Choice: Rose Geranium 
Other: Palmerosa, Bay Leaves, Eucalyptus, European Pennyroyal
Lavender, Tickweed (American pennyroyal)

Mosquitoes: Pennyroyal, lemon balm (citronella), thyme, lavender

Blackflies: Sassafras, lavender, eucalyptus, pennyroyal, cedar, lemon balm (citronella), peppermint

Head Lice: Tea tree, rosemary, lavender, eucalyptus, rose geranium

Fleas: Orange oil

A note about wasps and yellow jackets: Don’t wear perfume, hair spray, or scented
deodorant. Avoid wearing bright colored clothing.