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 Album Frame quilt block is another great choice for a beginner quilter to learn the piecing skills. This block is composed of simple shapes -- squares and rectangles -- and also the most commonly used quilt patch -- the half square triangle unit.
This quilt block is made of up two distinct block styles -- the nine patch for the central motif and then this small quilt block is used as the centre in the final block which then is classed as an uneven nine patch. The uneven nine patch is constructed in the same manner as the nine patch, but because all of the nine separate patches are not the same size, hence the name "uneven" nine patch.
The sample quilts illustrated give you some ideas on how to create a quilt using this one block. The straight set quilt uses sashing to separate the blocks while the on point setting uses additional plain squares to set off the arrangement.