A metal tray may be a simple steel or iron tray to carry items with or it may be more decorative than useful. You’ll find flat trays for bringing ham and eggs to bed with you, decorated metal trays that are meant to be used for decoration only, and even tiered metal trays to display whatever you like.
If you choose a tray for decorative purposes, think about what you’ll display on it. Then you can choose the right tray for the job. For example, flowers, cakes, and cookies all look very nice on tiered trays, while they aren’t nearly as impressive laid flat.