IMHO I would love to see a pin strip of the darker purple then the light border and green binding. If you want to go a little bigger. A green strip, dk purple pin strip, the lavender and bind in the green. JMHO
I would test drive every idea you get here and see how they look to you - put it on a wall and walk by all afternoon with the ones you like - the right one should stand out to you and you'll know the minute you put it up.