16 patch/checkerboard quilt block/St Louis 16 patch

 Take 4 four patches and arrange in a 2x2 grid and you end up with a 16 patch block.

There are multiple ways to make four patches (and thus the 16 patch).

This is from Quilt Codex

This one is from Kate at Last Homely House

This uses the strip method

Chain piecing is used here

Other 2x2 blocks