Oh wow! Design my own fridge, yes please! 
Our current fridge freezer has broken veg trays and drawers which are held together by brown tape
and are broken so slice my fingers when I try to use it, and the freezer drawers fall down into themselves and get wedged. We are currently looking at refitting our kitchen and are currently looking at a separate fridge and freezer (especially as our freezer just defrosted, froze and defrosted again a load of home-cooked ready meals which ended up having to be binned
).
I would like move-able shelving both in the door and inside the fridge. I would like a corner for (4?) bottle storage to keep wine
and other alcohol/non-alcohol drinks chilled, big drawers for veg that can comfortably accommodate the home-grown size broccoli and cauliflower without having to cut them in half. Possibly two smaller drawers for fresh fruit, so it doesn't get squashed. A very thin drawer for sliced meats like bacon and ham, some nice easy to clean sturdy shelves that can be adjusted like someone put above to accommodate a Christmas Turkey or some tall jugs of drink for BBQs. Raw meat drawer or shelf at the bottom.
In the door, there must be a space for butters and spreads, bottles/cartons of milk and juice and some condiment jars. There must be an ice compartment for ice-cubes which has a flat not rigid floor so that they don't spill.
It must regulate itself and not freeze up.
It must have a thermometer in a relevant part of the fridge and a thermostat that is easy to reach and doesn't get hidden or knocked by contents, and a display of the temperature on the outside of the fridge.
It must have an alarm if the door is left open or the fridge temp rises above the desired temperature.
Ideally the fridge would have a scanner for all goods in with the use-by time and display what needs eating by when.
I am not too worried about the colour of the fridge but the handle must not be flimsy and able to snap off or chip.
Drawers and shelves, designed to fit in a dishwasher would be brilliant, but definitely not able to chip or crack.
Clear guidance and/or self-labeling system within the fridge as to where things ideally should go.
If it is a fridge freezer then a mixture of shelving in the freezer to cope with boxes of products and bags and I am not sure how, but an ability to defrost the freezer without the fridge getting warm, better still: frost free.
A quick freeze function for freezing home produce whilst minimising the vitamins lost etc. cause I can do that bit when re-heating the dinner in the microwave after cooking
A good energy rating.
Ideally some way of recording the shopping list on the outside of the fridge - maybe a screen you can write on that can sync with mobile phone to transfer the shopping list?
, ooo and an app on the door that can provide a nutritious, easy and quick to cook meal out of 5 ingredients in the fridge at that time.
Wow, can't wait!! 