I make a lot of Bragello quilts, and I just do straight lines from the top to bottom, or top to bottom and side to side. I don't want my quilting to really "show." I want my design to be what "speaks."
Here is one I just finished. Perhaps it will help you decide. Sometimes I stitch quite a bit farther apart. It depends on the batting. Normally I just stitch top to bottom about 2 1/2 inches apart...
Don't do an overall pattern unless you just want to. Straight lines can be fine.
Dina