Go to Green Fairy's blog
http://greenfairyquilts.blogspot.com/ and look through her archives or gallery. She has done many many sampler quilts with different designs in each block.
Pick a theme and run with it. Like feathers? They can be modified to fit many, many different shapes like the points in a star, a background rectangle or triangle, a feather wreath in the center square of a churn dash, etc.
Here is a sampler I did with a different design done in each block:
http://www.quiltingboard.com/picture...c-t185132.html
You are only limited by your imagination and comfort zone and the comfort zone is meant to be broken out of.