I Googled it.
And once again, Google came through for me. I found recipes and ideas for a spa party. One box of Epson salt and sea salt, a borrowed chocolate fountain, some fruit, a chapstick making kit, a pound cake straight from my breadmaker, a cake my mom made and graciously offered me, some bottles of fingernail polish, a few Mary Kay mirrors, and one Papa Murphy's pizza later, I had a success of a party. Just look and see for yourself.
The girls made bath salts, lip balm, and a cucumber-parsley-yogurt face mask.
Izzy: "Well, that was an interesting experience."
And of course, they did each others hair. And mine. (No pictures of that!)
Megan declared it, "The best birthday party ever." Thank you, Google!