yum, moussaka here too - an alternative to cheese sauce for the topping is to beat together 2 tbs of flour, 1 small pot yoghurt, 4 eggs and plenty of grated cheese - it fluffs up like a souffle and is gorgeous. I sometimes put slices of cooked potato on the top too. I'm sure no greek person would recognise it but its delicious.
an alternative to grilling which uses less oil is to lightly brush both sides with oil and cook on a baking tray in a medium oven till as brown as you want them.
aubergine 'canneloni' - slice lengthways really thinly and wrap around other veg (also sliced lengthways) like peppers, courgettes etc and some cheese (feta/mozarella, whatever you like) and bake in a tomato sauce with cheese on top.
I also put cubes in lots of casserole/ratatouille-type things and my dd (18 months) picks out the aubergine bits because they are her favourite.