I like the idea of using corrugated roof with clear - so light can get in... but I guess it will depend on what material it is? I am happy to clean it every so often - but will need a ladder!! Like this shape and simplicity..
How To Build A Shed From Repurposed Pallets http://theownerbuildernetwork.co/gana A shed is almost essential for every home. Where else can you store the tools, lawn mower and miscellaneous stuff that doesn’t fit in the house? This one is that bit better because it’s made from recycled pallets.
All this shed would cost you is, the work. It's made from pallets. So, just gather some pallets & create your own garden shed/getaway. Via: http://www.scrapality.com/2013/09/project-pallet-shed-finishing-touches.html