Love your blocks, great work.
When you say 'trapunto feather heart', are you talking about using the background fabric, then quilting the feather heart on. So, it would be star, background, star, background, etc. That would be my first choice. Second choice would be appliqued hearts, maybe using the floral fabric.
I agree with barnbum the other blocks are too busy to go with the star block. Simple will make the quilt "POP" more, too busy and everything is lost.
Good luck on finishing.