Use Color Right base color and QuickCount color formulas to tint icing in the following shades:
-- Bright & Bold Yellow (formula 109): 2 cups icing + 2 O + 10 Y
-- Bright & Bold Green (formula 368): 2 cups icing + 8 B + 21 Y
-- Bright & Bold Teal (formula 3262): 2 cups icing + 8 B + 1 Y
Make cookies 1 day in advance.
Prepare and roll out dough. Use crinkled side of B square cut-out to cut cookies. Bake and cool.
Prepare icing also 1 day in advance.
Tint 2 cups Royal Icing each yellow, green and teal. Reserve 2 cups white. Thin a portion of each color, including white, for filling in cookies. Reserve remaining full-strength icing.
Outline cookies also 1 day in advance.
Use tip 3, a parchment bag and full-strength white icing to outline cookies, including section dividers of multi-colored cookies. Let dry, about 1 hour.
Fill in cookies also 1 day in advance.
Use a cut parchment bag and thinned icings to fill in cookies. Let dry, about 8 hours.
Use thinned icings in all colors to cover cookies and sections of multi-colored cookies. Let dry, about 8 hours.