Solar Charger Made

i need help!!...
i have to make a project(model) for design and technology n i dont know what to make.....
for example one of my friends made a table n chair(2 in 1)....
another one made chair with solar panels on its arm rest....these solar panels are used to supply electricity to a mobile charger which charges a cell phone.....this chair could be taken to far off places where there is no source of electricity as well as be used as a chair.....
plz give such sort of ideas.....