Milk Cartons to Building Blocks

What you need:

• Empty milk cartons.
• White acrylic color as a base coat (or a white primer).
• Additional (non-white) acrylic colors.
• Brush. 

How to proceed:

• Empty the milk cartons and clean them out with running water.
• Prepare a workspace to prevent color drops on your table. :-)
• Paint a white base coat onto the cartons to cover up any of the original printing.
• Let dry.
• Paint over it with the acrylic colors.
• Optional: paint windows and doors to create a city of sky scrapers.