Have a long soak in the tub.
An hour to yourself to craft/read/relax while DH deals with any and all demands from your kids.
A trip to the library or bookstore alone to browse, even if you buy nothing.
Use your good dishes and light candles for supper, even if you are eating regular everyday food.
Splurge on an inexpensive $10 bouquet of flowers for yourself.
A nice glass of wine/special coffee/decadent hot chocolate you keep just for your celebrate day.
Go donate blood and celebrate that you have the power to save someone else.
Wear the perfume you don't usually wear very often or the necklace you only wear on special days.