since you are using a 301, (i have one also) i would think in a 2" pattern as it may be easier to control the fabric. when you look at the logs in your block, you will have a better idea of what might work. for instance, curves might be a huge challenge in a 2" strip, but waves might not be. a small feather would allow you to play with feathers. or you might consider a running leaf or heart design. that will give you practice moving the quilt in curves without locking you in to the detail of a feather. i like to look at the fabrics in the block and see if there is a pattern i can simplify and repeat in the actual quilting. the biggest thing it to keep it simple. i hope you have fun with it and would love to see a pic of your end result. Happy Quilting!