Hot off the sewing machine: the Ferris Wheel quilt! There's a pattern for it too. This is a fun way to make fan blocks. No paper-piecing, no fabric foundations. You make them "by eye."
I like the spinning wheel effect you get with striped fabrics (below).
Here's another variation. The improv aspect shows up more in the example below.
Take a look at the pattern: Ferris Wheel Quilt.