Churn Dash blocks can be very effective all on their own.
If it's separation you're looking for, rather than blocks, what about sashing strips?
The cornerstones could be plain or done as QSTs.
With not seeing your planned Strawberry Shortcake blocks, colour scheme, fabrics used, size, etc., it's hard to guess what would work.
You've been given some good suggestions.
I'd start by making some sample blocks and see what works best.