ive seen nothing but diamond white pearl is300s with ivory interior. (im getting mine with black leather interior) it looks ok, but the only problems i have with ivory interior is that the dash is black no matter what and the carpet gets dirty rather quickly.
I have a DWP with ivory interior. I got the LP interior because I liked the 2-tone dash and the fact that it is black on top (not the greenish-grey color of the others). I think the ivory interior provides a good contrast and is cooler, although I think the Ecsaine may even make the black interior comfortable in our hot Dallas summers. There are some pictures of the different interiors on page 5 of the image gallery.