I tried searching the store for a potty-training kit, and the only thing that came up when I searched "potty" was a Christmas kit, lol.
I'm catching up on old scrapping and have finally hit the potty-training pics, so you'll have at least one guaranteed purchase if you make a potty-related kit.
Maybe even a bathroom-related kit? You could call it "bathroom business" or something, lol, and include potty training, GI health issues, bathtime, shaving, tooth-brushing, etc.
Anyway, just throwing it out there. I know I saw a few potty-training kits back in the day, but it's been a while, and I don't have any now.