I came across child-sized toilets and pedestal sinks in Renovator's catalog. Some toilets have Chippy Mouse, Buddy Bear, Fire Dragon, Prancing Unicorn, and Piggy Bear designs; they have matching sinks. The description says that you can install and uninstall them with ease. The catalog also has a lovely selection of vessel sinks. (I've never wanted one, no matter how beautiful they are, because I don't think they're practical. Why would I want to wash the outside of a sink too?! The catalog does say that they're virtually unbreakable...)
Link:The Renovator's Supply - Reproduction Antique Hardware, Restoration Hardware-Plumbing-Lighting for your remodeling needs.