Start by cutting out your squares.
Then, sew 4 of your squares together to make the main body of your block.
Then, snip little corners (1/4 x 1/4 inch) out of all four corners of your two remaining squares.
Then pin it to the main body, with right sides together. Fold the little square openings together at the sides, creating a square corner as you pin.
Do the same with the bottom but leave one side open so that you can turn it right side out.
Turn it right side and and poke out the corners so that they are nice a sharp/crisp. Stuff with batting. Fill it up pretty well so that the block will hold its shape.
Fold down both sides of the opening a 1/4 inch and hand stitch it closed.
All done.
Now you have a block (or blocks) to accompany your rings.