Aside from what you've mentioned, you could try vacuum play. Running a wartenburg wheel over an over-engorged nipple is always fun... well at least for me.

I've also used a can of the electronic spray that you use for dusting. but... turn it over so you spray out some of the fluid very slowwly in lines, my m-jo says sometimes it feels so cold that shakes her, and other times it feels like its burning.

Just use your head and go slow, no dumping the whole can on a single nipple.