Fish tank converted into mini greenhouse for starting seeds indoors. Plastic wrap stretched across the top is opened or removed as plants start to grow to avoid killing/steaming/overheating them. Love this idea.
Hake a Mini Green house. Inexpensive Mini-Greenhouse You can build this raised garden bed mini-greenhouse to extend your growing season with used railroad ties for the base and some scrap wood and sheet plastic for the cover.
Inexpensive Mini Greenhouses - These worked PHENOMENALLY for seed starting this year. It was nice to be able to easily carry them all in when there was a frost warning. I kept the lids on during the day to keep heat/moisture in. Love this idea!