the dishes could be designed to fit on top of each other, one as base, one as lid, again, something ingenious and aesthetic!
My pyrex casserole dishes do just this, but are very plain and funtional. I would love a varient on this theme which was 'prettier'.
I agree about colours clashing with food, but I prefer coloured to plain glass, except when it's textured glass. :roll: So how about a coloured rim or a bit of colour somewhere, just not too much so it distracts from what's in the dishes?
A serving dish / bowl I am using a lot at the moment (for salads or fruit salad) is clear glass, but textured on the outside, and an interesting shape. It's shaped like an apple, and the handle is the stalk. It's a bit twee, but it's very useful. Doesn't stack with anything at all, though

Handles should be shaped or positioned so that they don't interfere with the stackability.
Divided dishes are good, but they tend to be either oval or oblong - boring! :roll: How about a different shape? Round or square but divided would be different. Or what about a divided dish with one end larger and one end smaller - sort of pear-shaped? :shock:
Now I'm getting excited, too!
Leni