The main purpose of a small garden shed is more than likely going to be for storage, unless you want to make it for a specific reason like maybe a potting shed. If you design a small garden shed the right way you will be able to get a lot more storage space than you might think you can.
What many people don't realize is how much the design of the roof on a small garden shed can affect not only storage but the overall look and feel of your shed.
If you build a shed that has a steeper pitch to it, it would allow you to build a space above the small garden shed that you could utilize for storage or anything else he could think of.
If you want an area that you can comfortably walk around and then you should consider building your roof with a pitch somewhere around a 10 and 12 pitch.
If you implement simple strategies such as the ones I listed above and you will be a lot maximize the amount of space within your small garden sheds. Just because the size of the shed is small, doesn't mean you can't add additional storage space. If you are creative and strategic you can get more space out of a small garden shed then you would with a larger shed.