So cheap and simple a sand tray for cuttings doesn’t need a photograph. Fill a deep seed tray or box with damp horticultural sand.
Use your sand tray to hold small cuttings or plant snippets to help them root.
This method of rooting and growing increases your stock of plants for negligible cost. At that cost you do not need many rooting successes to give you a payback.
Silver leaved plants, perennials, even petunias can be rooted in a sand tray then grown on or be planted in the garden.
Use 2″-4″ young new growth cuttings and strip off the bottom leaves then plunge the bottom third in the sand. It will take a few weeks in summer and a few months in cooler weather to get root growth.