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 took liberties with this Casino Royale quilt block by adding in a third colour. I think it has far more possibilities when you start to lay out the nine patch blocks in your quilt. I thought it needed both red and black to go along with the "casino" colour scheme of a roulette table.
Another change is subtle -- I made the centre patch as a square in a square, rather than the original group of four separate half square triangle units. I always think less seams equates to a more precise block and of course, less bulk.
The sample quilts illustrated use 90 degree rotations of some of the blocks to produce a secondary pattern, which is always a nice surprise.
More "Gambling" Theme Blocks:
~ Road to Vegas
~ Roulette Wheel
~ Roll of the Dice
~ Wheel of Fortune