You could make a top hat ring (or maybe for watches because it's your brothers bathroom) holder.
If you have/need one you could paint a laundry basket or rubbish in with oompa loompas or candy or whatever.
Brown (or lime green or purple) towels with candy related trim.
Golden ticket photo frame.
You could fabric paint or embroider a bathrobe for the sake of it.
Theres this special type of paint that you draw with onto plastic, then you peel it off and you have a groovy thingy you can stick on glass ie. a mirror and then you can peel them off again (but they go kinda odd and ruined if you do that after leaving them on).
You could make felt food airfresheners and hang them around the room on ribbons.
Oh, and you could modpodge wonka wrappers to something.
And if for some strange reason you knew how to make toilet seats, you could make one with stuff in it. But most people (me included) don't know how to make toilet seats...
And you could make a toilet paper holder by getting clay to make a top hat, and having a peice of wire sticking out like in this piccy: