If you're wanting something slightly different but complimentary to that trim, I'd look for cool grays.
SW 9136 Lullaby - more of a blue gray
SW 6525 Rarified Air - lighter cool gray
If you wanted to go a bit more interesting, I'd look at the colors in the very pale blue family. I wouldn't trust the accuracy of the photo to match up with any online paint sample, but I think something similar (but not necessarily this color if it doesn't look quite right).
Basically I'd find a paint sample card where they have the array of shades, match up the trim color, then go two or three shades lighter, or darker.
SW 9144 Moonmist
^this seems like it might be a few shades lighter than the trim and a bluer color
SW 9146 Faded Flaxflower
^ seems a few shades darker and might be interesting contrast
No matter what, I do suggest getting a few samples and painting a few 2 foot squares on the wall near the trim so you can get the full effect in daylight.