I stumbled across this really cool soap dispenser by Natalie Stämpfli. I think scraping soap flakes from a bar would bring a lot of fun into hand washing, similar to how foamy soap helps kids encourage to wash. It also prevents a gross, slimy soap bar from sitting on the sink and making a mess!
Click through the photo to go to Stämpfli’s site. She discusses the environmental concerns of liquid soap, along with a second soap dispenser design she made for use in the shower.