You'll
need 12 half square triangles, white or white-on-white matched with
a tone on tone, solid, marble, or small print. I'm sticking with the
same colors as last time so people that did the swap can use some
of those squares.
Measure and trim them to make sure they are
3½ inches square. The ones I brought home from the swap were
a variety of sizes. That happens when you have several quilters using
different methods.
If
you start with a 4 inch square to make your half square triangles,
then you WILL have to trim them a tad. They'll all be around an eighth
of an inch too big. You may think it's being persnickety to trim that
sliver off, but by the time you add all the slivers for that top row
of four blocks, sliver + sliver + sliver + sliver = half an inch.
That makes the top row not fit with the second row... which has only
two slivers extra. Make sense?
You
will also need four 3½ inch squares for the center of the block.