I know it's only January, but the planting season will fast approach. Here's a little, very easy, way to make miniature green houses for your garden. It uses literally three parts, a hanging basket frame, glazing film, (which seems to be simply shrink wrap), and double sided tape to hold it together. You'll also need a hair dryer to shrink the glazing film to size after it's taped on. According to the tutorial, it's strong enough to last several months with consistent use. And if the plastic does rip or break, it'd be simple enough to replace (just peel it off and redo it). And it looks so beautiful too!
Full picture tutorial found here: http://www.gardenersworld.com/how-to/projects/garden-diy/how-to-make-a-cloche-for-seeds/82.html