One of the blogs a follow is Wayne Kollinger's Sketch Book. I find his exploration of what works and what doesn't endlessly fascinating (regardless of whether I always agree with his aesthetics). His most recent post explores the idea of designing a new quilt block by adding to the underlying grid. He took several 3x3 blocks, adding a frame to give a 5x5 design space with the original block at its center.
I thought this looked like a wonderfully fun idea, but decided to work from 4x4 blocks. Here are some of my first results, built around the "Crown of Thorns" block (above right).
I came up with three different new blocks, each of which I quite like:
And here are three quilts with those three blocks: