I say vanilla, too. However, you could do a variation on a "tin roof," which is vanilla ice cream, peanuts and chocolate sauce.
You could crumble the brittle up and use it in place of the peanuts. The sugary part of the brittle would lend a bit of a butterscotch flavor to the who shebang. Yummy!
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!