I did the Farmer's Wife 1930's blocks, working through the whole book. I made them all paper pieced, to learn pping. Finished all of the blocks, but PPing is still not something I love. I view it more as a necessary evil, sometimes needed.
I also challenged myself to learn needleturn applique by doing a Hawaiian quilt... and hand quilting too. It was my first needleturn and I'm happy with it, but probably won't ever do another one.
Now I have just bought a LA, so my new challenge is to learn how to get better at using it.