Three knitted squares.
May be an Afghan one day...
These three squares are, all, designed by the same designer. She made them in one colour, but, as you can see, the design allows you to do what you want. The patterns are charts, so you can easily follow them. they, all, are on Harry Potter world.
And... I saw that I used two different shades of blue when I wanted to make a photo of the Wimbourne Wasps square, too late.