They are easy to make and I thought I would post a tutorial on how I make these.
I layer a piece of batting between two pieces of fabric (right sides facing out).
I trim all three layers at once to 8-1/2" wide by whatever length the fabric measures.
I use the Kaye Wood's Starmaker 6 ruler to cut equilateral triangles from the fabric. But any 60 degree triangle ruler would work.
The number of triangles I get depends on the length of the fabric strip. And sometimes I get one smaller triangle (the one on the left) but I can still use it!
Using the walking foot, I sew a running stitch through all layers along one edge of the triangle. The stitching is less than a 1/4" from the edge.
When I get to the corner, I sew off the end, turn the triangle, reset the needle to sew the next edge layers. Sometime I find the fabric shifts a bit, so I line up the edge of the top fabric with the foot. It will be trimmed after all 3 sides have been stitched, so not a concern.
Trim all the edges to no less than 1/8" from stitching line.
When I am making many of the same item, I try time-saving steps. I made a template to mark the corner fold lines. The purple triangle template measures 2" from tip to base. As you can see, I lay the template on the corner, mark the fold line, then pin each corner down to show the fold.
I am ready to sew the buttons (or whatever other decoration) on the smaller, folded triangles. I use some basting tape under the button to hold it in place. (It is water soluble and will wash away if soaked in water for a bit.)
I take only the foot off my sewing machine, not the shank. When the presser foot is lowered, the shank holds the button. I put the feed dogs down and set a zig-zag stitch that sews back and forth through the button holes. **It is important to use the hand wheel to see that the needle fits in the holes properly, or the needle will break.**
If there are 4 button holes, I raise the needle, raise the presser foot, turn the piece a 1/4 turn and test the needle zig-zag in the unsewn holes before I begin sewing in the last 2 holes.
If I can bring the top threads to the back side and tie all 4 threads on the back, I do. If not, the zig-zag is usually secure enough to hold the threads and I cut the top threads before the under threads. Here is my piece with all the buttons on it.
Now I fold the sides and sew them. (Excuse the stained thumb, I did a half bushel of apples for applesauce this morning.)
I sew from the folded edge, using a reverse stitch (backing up) to secure the beginning stitches. I end with reverse stitches where the small triangles begin.
It is almost done. I need to clip the threads.
And, finally, it is done! They are cute for any season or reason. I hope you will try to make a few. I suppose on could sew a decorative edge rather that straight stitching. If you find another edge finish, let me know. I'd love to here or see a photo of what you did.