Orna, Hank and Peggy are all very good with their bowls...mind you Hank and Peggy have an enormous trough they can both sit in and eat :P
I tend to hide treats around the cage but I like to have normal food in a bowl (especially with older ones) so I can get an idea of how much is being eaten. I do tend to use bowls that all the hamsters in the cage could fit in to stop squabbles though.
My WW is one of the tidiest hamsters i have - she never throws her food about and when i go to get her out of the cage she steps into the bowl so i can lift her out (thats an old habit from when she was in the perfecto tank)
I also use jar lids like baby food lids (i bought waffles baby food), Waffles is really the only one in need of a shallow dish so i put her special ground food mix in there