The Star in the Cabin block shows the possibilities of thousands of log cabin blocks. It takes another block and uses it as the centre block of a log cabin. I have used a sawtooth star, but you could use any block that you want.
The Offset Log Cabin block is kind of fun. It is almost the same as the regular log cabin block, but the light and dark bars are different widths. This results in a curved look, more or less depending on how much the difference is.
The Greek Key looks like a maze, and it can be complicated if you try to wing it. But if you follow these steps, it is actually quite easy. It is a log cabin, but the rectangular pieces go on in a different order.