Hiya Linz,
I also use the containers from microwave ready meals (asdas curries) for seed trays or as trays for small pots to sit in aswell, they are great for the purpose, ive got loads of them, wee quick wash & off you go. Also If youve got any old chipped plates or cups (porcelain or china ones), even old ceramic tiles or floor tiles, you can break them up & use them for crock in the bottoms of larger planters or pots & containers.
Cya Angie
i uses old meat plastic trays for 'drip trays' i put them in the dish water and a quite hot wash so all blood ,meat traces are removed and then i uses these to sit plants in.
Linz