Household items best for anal stimulation?

My girlfriend is coming back from a 2-week vacation and we are planning a little something together but I need something that would work really good for anal stimulation with anything in the house that might work because we need it maybe something like a large marker or something preferebly better maybe. COMON GUYS THIS IS IMPORTANT.

how about the obvious: your cock
or a carrot or cucumber (they're non-toxic, pieces won't come off in your ass, and they can be peeled to size)