A Disclaimer: I thought this would be gross, too, the first time I heard it.
But it's not.
Why does everything we put on ice cream have to be sweet? Try the following (in small quantity, because it's very rich): Vanilla Ice Cream** + A Drizzle of Olive Oil + A Drizzle of Sea Salt.
I first heard this suggestion from a caller on NPR's The Splendid Table, a cooking show that airs Saturdays at noon.* I was very skeptical, until one night I found I had all the ingredients and tried it. It's so rich it knocks you flat after a few spoonfuls, but it is deeeeelightful. (And I don't use that many e's lightly.)
*Is it sad that I plan my Saturdays around listening to this show? At least it's not Saturday night...
**I Suggest the "Five" line of ice cream, which contains only five ingredients.