The interview I had for my job said I could pick any topic that I would teach to KS3 RE. Cue blind panic thinking I have no idea after other interviews being so structured. Creative to me just suggests you need to be doing something not just writing or work that they might not find attractive. Things like drama, art, building, dance, teamwork things like that. I could be way off but this is how I took it. Take a deep breath and step back from it. You will find that you will get some ideas coming to you as soon as you relax.