How can you make a cool patterned doormat of a usual rug in 15 minutes? Very easy! You’ll need a simple doormat, some colors of paint, circular sponges of various sizes. Mix the colors on the plates and with the help of sponges make polka dot patterns on the rug pressing them to the doormat. Cover the entire doormat with these dots of different colors and sizes. Let dry for several hours and start using! Polka dot is a popular pattern and will always be to the point, and it gives a usual doormat a cool and inviting look.