Out of Space in the Storage Shed

My storage shed is bursting at the seams. For not only is it a storage shed, it's a greenhouse, too. Unfortunately, it's just become packed to the walls with junk. Thankfully, I didn't have to store the lawn fertilizer for long ... the dandelions are tasting the wholesome goodness of the Farmers Co-Op's finest chemical concoction right now. My jury-rigged spreader did a admirable job of distributing the weed & feed, the lawn's looking better than ever, and the storage shed's just a little bit less crowded.

I need to find a way to add some storage space to the shed without increasing its footprint past the magical 100 square foot mark. A good morning's tidying up will go a long way to meeting that goal.