I think rather than asking for someone else's ideas, it would be a good learning exercise to develop your own visual language. You can start by creating mood board for your design, find magazine clippings, Argos catalogue images, notes, scribbles etc. Then using these as a springboard, start by defining a list of what features you want your final design to exhibit, start creating a few very very loose scribbles. Then choose one or more to take on to further development.
I would rather help you to learn to learn, than do something for you. ;-)