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!
Rolls of roses: Simply plunge the cuttings into the ground. Before planting cuttings, push the bottom end into a small potato, which keeps the cuttings moist as they develop roots. It sounds crazy, but the row of allotment roses is proof it works.