Mushroom punnets/baskets are useful, coffee cups, and fruit punnets too. If you find a fruit punnet with a clear plastic lid, all the better as the lid can help warm the soil, acting like a mini greenhouse or propagator.
Also keep your eye out for more unusual containers. This photo for instance shows a pyramid shaped container which once held a heap of profiteroles/cream puffs. It is going to be very useful in the spring for starting off new seeds
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When I buy my chicken in bulk, they come in big plastic containers. The containers make perfect seedling trays for the green house and they're free. I also use all the plastic containers that tomatoes, plums, etc. come in.