Sometimes creativity gets easier when you remove choices instead of adding more.
Choose one color family
White, red, green, gold, or even blue can become the entire decorating palette.
Use texture for variety
Swirls, dots, lines, powdered sugar, and different candies can keep one color interesting.
Let two teams solve the same rule differently
Give both groups the same color and see how different the houses become.
Use the two cakes as the experiment
The Tomte Cake bakes two house-shaped cakes, making it easy to try the same decorating rule twice and compare the results.