As suggested by Johan in the fly tying thread, here is a thread for putting down those ideas.

I like angler interviews with successful anglers who have specific ways of doing things. Mr Marquand's bright pink size 8 clousers for kahawai come to mind. They are completely unexpected but seem to be very successful for Dick. A video investigating his way of doing things would be great!

Also the colourful fly versus natural fly fishing contest, as suggested in the fly tying thread.

I'm sure there is plenty of other ideas out there

+1 for flounder!

It hardly qualifies as night fishing at that spot when you're standing under that many lights. I know of a very dark rock on a very dark beach that will give you more of a true night fishing experience. It might not make a great video though