Well known songs that are good to sing & play on the piano?

I REALLY wanted to do Heaven by DJ Sammy (the slow version) for my Talent Show but many people have already sang this. I thought of doing A Thousand Miles by Vanessa Carlton or Listen To Your Heart by DHT but it seems kind of boring when you're just singing and playing it on the piano. Can someone help me find a good, well know song that can be played on the piano & great to sing? Thank youuu (: