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.
Crown of Thorns
Free Quilt Block Pattern
The Crown of Thorns quilt block is made in one of the most popular block sizes - the 10" quilt block which can sometimes make the math easier for quilters who wish to scale up or down the given block size. (I have also included cutting instructions for a 7 1/2" block as well.)
This quilt block is one of the uneven nine patch blocks, so called because the final three rows of sewing are not all the same size. (You will find that many 10" blocks are constructed as uneven nine patch blocks.) However, it can be easily sewn as five rows of five patches if you prefer.
This block makes great use of the common half square triangle patches so it is an easy block to create.
Some interesting layout arrangements can be made using this Crown of Thorns quilt block, as illustrated in the sample quilts shown.