I am learning to FMQ b/c I was limiting myself to making quilts that looked good with walking foot/straight line quilting only and that was way too limiting...
I don't remember where I learned this tip but you can buy a clear piece of Plexiglass (or even a similar material) and lay it on a quilt. Then draw your quilt design on the plexiglass to "audition" the design. Erase and try again if you don't like it. I have started a binder of FMQ designs to help trigger quilting ideas. I also look at the Daystyle quilting website. She has hundreds of FMQ ideas.