Tangram Fabric Puzzle

Do you want to make your own set of tangram-esque puzzle pieces? Great. Let’s get to work.

The process is pretty simple. You’ll be making a bunch of half-square triangles, sewing a backing and batting to it, turning it right side out, and slip-stitching the opening closed. Here’s the details:

First, choose your fabrics. You don’t need much of each color. I used seven different colors, and only used about 1/6th of a yard each color, and about a third of a yard of the white.
Really, you can use whatever fabric you want, with as many different colors as you want, and make as many pieces as you want.
Each color is paired with every other color once (7 colors, so the math is 6 + 5 + 4 + 3 + 2 + 1 = 26; I think this works with whatever number of colors you have: take the number of colors, minus one, then add all the numbers to that number and on down), and by cutting the pieces in half (you’ll see later) you get a total of 42 tile pieces.

If you want to end up with 42 finished squares like I did, you’ll need to cut six 4″ squares in each color, including the white (if you are using a different number of colors, the number of squares you’ll need to cut will be one less than the number of colors you have). For the backing, you’ll need forty-two 3 3/4″ squares in whatever combination of colors you want; I used 18 squares in white and 4 squares of every other color.
Match up one of each color with one of every other color, red with orange, red with yellow, red with green, and so on. If you’re using fabric with a pattern, make sure to keep right sides together.
Use a pencil or a disappearing fabric marker to draw a line from one corner to another.
Sew from one corner of the square diagonally to the opposite corner, using the line you made as the guide for your presser foot.
Turn the square around and sew down the opposite side of the line in the same manner. You will now have to parallel lines of stitching.
Cut each square in half along the diagonal line you marked in step 4.
Press the squares open with the seam pressed toward the darker fabric.
(I’m sure there are lots great tutorials about how to do half-square triangles. Calli from Make It Do just did a very nice little tutorial about how to do half-square triangles, and it looks very similar to the way I did it, so if you need another tutorial on how to do half-square triangles, check it out.)
Cut out 42 3 3/4″ squares of batting (I cut out twice that because the batting I had was very thin, and I wanted it to have a little more heft.
Lay each pieced square on top of a 3 3/4″ square, right sides together.
Lay your matched pieces on top of one piece of batting.
Sew all the way around your square (1/4″ seam allowance), leaving a 1 1/2″ opening for turning out.
Clip off the corners (sorry, I didn’t show this step, but basically you want to trim to as close to the corner as possible without cutting through the stitching).
Using a turning tool of some sort (I used hemostats, which I read about here), turn out each piece, making sure to push the corners nicely.
Tuck in the open seam, and slip stitch the opening closed. I don’t really know how to describe the slip stitch, I stitched through both sides of the fabric as closely as possible so the thread doesn’t show, then I pulled the thread back through half an inch, made a knot, and “popped” the knot through the fabric to bury it inside (that’s how it was described to me when I was first learning to sew as a teenager, so please forgive my lack of eloquence). Perhaps the pictures will help the description.
Repeat 41 times, and you’re done. Now go enjoy your finished work.