The half square triangle unit is probably the most commonly used patch in a quilt block -- well it is second only to the square. It is made simply with two triangles, filling up half the square each -- hence the name. Take a quick look through this website, or in any quilting magazine, and you will start to notice that this half square triangle, regardless of its size, is present in more quilts than not.
Free Quilt Block Pattern
I had some fun playing around with this Opposites Attract quilt block. At first glance it looks kind of boring as it is often made with only two fabrics -- a dark and a light. That is what I did for this block pattern here. However, this is also a chance to use up all of those scraps, by separating your quilt fabric stash into the values of dark and light and the resultant quilt will be a wonderful scrappy version. (Scrap quilts are my favourites, but I like to change it up for you, the viewer.)
This quilt block is considered to be a five patch, as it is made on a 5 by 5 grid. However, it is sewn together as an uneven nine patch. Since half square triangles are the only patches used in this quilt block, it is quite simple to assemble. Then it is just the use of your imagination to create a new heirloom quilt.
I played around with the quilt layouts. You will see two additional pages in the pattern to illustrate this. In addition to the quilts shown here, which use a simple straight set and also a setting on point, I grouped four blocks together to make a "new" larger block, in two different ways and then illustrated quilts using those new blocks. The results are fun and interesting.
Related - Lady of the Lake