Very nice!Small nymphs are kept in a variety of containers,once past their 2nd instar the containers get a lot more uniformed ;-)
Older instars in these,stood upright and appropriately meshed: http://www.thespidershop.co.uk/insect/product_info.php?products_id=521
Older Instars again I keep in 1.3l braplast tubs,stood upright and vented again very uniformed and easy to cut in as much ventilation as needed