I'm going to play with a kind of block I call an Echo block. I make an Echo block by combining a traditional block with a smaller version of it to make a new block.
The small block is superimposed in the corner of the large block.
The new block can be made from squares, half-square triangles and quarter-square triangles.
I tried coloring it several ways and like this version.
Four of the new block rotated make this larger block which I used to make the design at the beginning of this
The block can, of course, be colored other ways and used other ways.