Yup! Used plastic bottles, egg cartons, soup cans, etc. for years and years. I too am itching to start growing my seeds but its too early. I have a big bay window in my kitchen that gets plenty of sun, but still add lights. I save seeds yearly and swap with friends. Its fun dreaming when looking out the window at all the snow and looking inside at the seed catalog that just came in the mail. Of course those photos are the best of the best, not like my garden. :)