Ingredients: 1 cup flour, 1 cup warm water, 2tsp. cream of tartar, 1tsp. cooking oil, 1/4 cup salt, Essential oils of choice (One should obviously stay away from oils that could cause a serious problem to the skin, etc). If color is desired food coloring or Kool-Aid powder work well. Kool-Aid also comes in a nice color variety Mix all ingredients in a saucepan over medium heat. Stir until smooth. Remove dough from the pan and knead until blended smooth. If you want colors, add food coloring or a pinch of Kool-Aid now until the desired color is made. Let cool. Now to make it aromatic, roll the dough into a ball and push a hole in it with thumb. Add a few drops of an essential oil (usually 1-3 to start) and knead the dough thoroughly. Sniff. Keep doing this until you get the aroma you are looking for.
Here are some single EO?s and color ideas that I like: Brown--Benzoin, Patchouly, or Cedarwood
Orange--Orange or Bergamot
Yellow--Lemon or Lemongrass
Green--Pine or Clary Sage
Red--Palmarosa or Geranium
Purple--Lavender or Ylang Ylang
Light Blue--Rosemary or Eucalyptus
Dark Blue--Sandalwood or Lavender
Pink--Ylang Ylang or Grapefruit

White--Peppermint or Sweet Birch.
Lavender scented in a deep purple colored dough is wonderful!!
Make small quantities and use them as office toys. Why sit and squeeze a tennis ball or rub a worry stone etc, while on the phone when you can squish, squeeze, roll, pinch, mash, and sniff play dough?!
For packaging the dough as a gift, put each aromatic dough in a seperate zip lock baggie and label according to scent with the color of the wording coordinating with the color of the dough. Leave the white one blank--it will give them something to think about. From there one could put all the zip lock baggies into a decorative container. The plastic containers baby wipes come in work well.