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
The Z Cross is the perfect block for a beginner quilter. It is made entirely of the most commonly used patches -- squares and half square triangles.
Although this quilt block is technically a five patch (meaning it is created on a 5 x 5 grid), I found it easier to construct it as an uneven nine patch. However, please do not hesitate to construct it in rows, if that is your preference.
I am always amazed when what appears to be a very ordinary block can create such an interesting secondary pattern when placed in the quilt. (Note how pinwheels appear when you place the blocks next to each other.) Needless to say I was really pleased with the resultant quilts I came up with while playing around with the layouts. Check out the sample quilts illustrated below.