What are the logs material? Are you wanting to emphasise the logs or the flowers? You could quilt vines across the logs flowing from one "flower" to the next. You could mimic the flowers in the blocks...! I usually have to wait until it "speaks" to me before I get a quilting design to go with. To test a design....like ditch quilting....pin from the back after you have sandwiched ...a small section and stand back and see if it works... Try a few stencils with chalk and se if they work...You have lots of options. Wait until finished and then look at it for a couple of days...it will let you know.