Welcome to the forum,... and to real life. Don't worry though. Your teammates will be glad to share in the credit!
I would suggest that you just look very carefully around your own world. Find some SIMPLE device (did you get that word? SIMPLE) that you use quite often, and just start asking yourself how you could make it easier, or faster, more useful, or if you really want to get a lot of brownie points in today's politically-correct world, more "green" (whatever the hell that means). My first college design project was a bathroom door lock that could be unlocked from the outside if necessary, like if a child was locked in a bathroom.