Supplies for the do-it-yourself painting area:
Palmer standard colors, 2oz, $1.85
Buying criteria:
Containers per painter = Number of hours * number of paintings per hour / paintings per container
( 3 * less than 20 ) / more than 20 = less than 3 = 1-3 bottles per painter
Therefore one bottle of each color for each painter will well more than suffice.
Red
Blue
Turquise
Green
Purple
Pink
Magenta
Orange
Yellow
Brown
Black
White
Artists planning to personally paint themselves and/or others should buy better. Spend a few dozen dollars on professional grade assortments from Snazaroo or Wolfe Brothers or Mehron, available at good costume shops such as Fantasy HQ.