I have to do a speech on belonging as well, however i have to use a visual representation to show it.
Some ideas to throw at you:
You could talk about acceptance to be in the gangs or migrants being accepted into the town they have come to live in. Or going to a new school, changing groups because of isolation.
Don't forget that belonging can mean not only mean to belong but not to belong as well, so exclusion, isolation, anything like that can be used as well. Use quotes from famous people, im using a CS lewis quotes in mine. You can pretty much rambol on about acceptance and not belonging, relating to pictures, moives, quotes, books. Anything really.
Hope that helps a tad.