YES puzzle

This is a YES puzzle, just take the 3 letters in a simmetric building. Can you solve it? :) I won't upload the solution images. If it's difficult, you can find the solution on the internet. Don't cheat! :D It only takes 22 minutes to print, but you can entertain your friends for a long time. Have fun with the puzzle. I tried with three different colors, but the end result is not that spectacular.