I thought about outlining the tulips with a green that matched the tulip leaves. Or perhaps a blue to pick up the blue in the setting triangles and border.
I did phone Karen to see what she might prefer.
It's slow going, so I'll have plenty of time to think about how to quilt the setting triangles. Right now I'm thinking of using yellow thread for partial feathered wreaths and then quilting feathers in the borders using gold thread.