Love the veggies in the grilled cheese idea! I actually have a cook book of how to hide veggies in foods kids like. The author says to keep offering veggies the traditional way, but with the hidden veggies you don't have to worry about whether or not the kids eat the traditional veggies
I also sing to the girls while they're in the bath, but we do it just for fun, we're lucky enough they don't fight washing too much - when they're in the bath anyway, the high chair is a different story!