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.
Queen Charlotte's Crown
Free Quilt Block Pattern
The Queen Charlotte's Crown quilt block is not one I have seen in a lot of quilts but it struck me as a lovely use of colour and it is a little unusual in the look of the block -- something that strikes me. (I like unusual).
This five patch quilt block is comprised solely of squares and half square triangles so it is an easy block to construct as an uneven nine patch.
In the two sample quilts shown, I have chosen to use the quilt block in groupings of four, rotating the blocks to make different designs. The use of sashing adds additional colour to the final quilts.