Many moons ago when I started work on a nursery as a lad, there were no plastic seed trays only wood ones that we built in the potting shed on wet winter days.
Now these charming wood seed trays are available in a set of three for £9.95 from www.burgonandball.com. They are made from untreated pine to ensure no contamination and are slatted for drainage. For that extra touch, the large tray has the word 'seedlings' branded onto the side.