A great technique for quickly generating ideas is to use nine-box brainstorming.
Draw a grid of nine boxes – like noughts and crosses (tic tac toe if you’re in the US) – and put your subject in the centre box.
Now fill the eight boxes that surround the centre box with ideas, one idea per box.
Take each idea, and place it in the middle of a new nine-box grid. Into each of the eight surrounding boxes put either a development of the idea or a visual treatment.
That’s 64 possible routes within 30 minutes.