Certainly! Feel free to bring anything you want for props. Many people bring items like balloons, banners, flowers, stuffed animals, etc.
Seniors typically bring things that express who they are. For example, Sports players have brought in balls, bats, sports apparel like jerseys. Singers have brought in microphones or anything they feel is relevant to their personalities.
Keep in mind that some props can get messy (ie: Cake Smash props, plants, artificial grass or greenery, rose petals, confetti, etc.) Just be aware that it is your responsibility to clean up the mess if you bring in messy props.
Be creative as you'd like. The sky is the limit!