Any ideas for visual art job interview?

Where I live, I was offered a job at this art program that paints murals around the city, paints houses, and many other things that involve art around town.

Well, for the interview we have to bring in 3 visual art pieces for them to judge in order to get the job. I already have my portfolios ready, but I’m assuming I need sculptures.

I have one down, and two to go, but no idea what to make. Any help? This is for a job.