wedding decor help - ceremony backdrop

Jo
Hey guys so I'm getting married next month and I'm struggling to come up with a backdrop for our ceremony. We're getting married in a small church that's really dated and I would like to cover the baptismal area that would be behind us. 
My fiancé used to be a photographer so we already have a frame he used for green screens now I just need something to put on it! 
I need it to be cheap, possibly a fast diy and something cute. My dress is a champagne/ivory color and our wedding colors are coral and turquoise with a touch of navy. 
Please attach pics if you have any! I've been scouring Pinterest and haven't seen what I'm looking for!