Was googling about on an unrelated topic and came across this dudes site.
http://bike-recumbent.com/ I actually have one of these buckets in the garage and was looking at it a moment ago when I stepped out to have a smoke. While not looking that it would work so great on the rear of my bike with the rack I currently run( size 14 , guarantee heel strike would happen) some one with small feet might be able to use it on the rear. Could possibly be configured to work on the front as well. Neat idea though particularly as he's using it on a recumbent.
Don't know if it had been shared before.