HNB said:
You could do parchment. It is an aged white. I think white is too bright normally and the pickups blend too much on white. Parchment looks better.
Couldn't agree more. Parchment.
Have you seen it? It's sort of an off-white, just slightly yellowed pearl (Mother of Toilet Seat). It will harmonize the white of the pup covers, the blue, and the amber of the headstock & neck.
To my eye, the contrast of the dark tortoise shell with the blue and white is too dramatic, a bit shocking. But you'll have a more sleek, integrated look with a Parchment guard.