Some time ago I started a scrappy quilt using a block called a four patch (shown below) I have recently gone back to this block and come up with some new (to me anyways ) ideas. Like the Tetris layouts I can see this being done either by crochet or by patchwork.
Here is the basic block.
A standard layout with the basic block.
A rainbow coloured Trip Around the World
Many Trips Around the World, rainbow style.