If you want to go a step further and separate your tools, you'll need to get a bit more creative. One way is to utilize PVC pipe to make containers for your tools by attaching to two pieces of wood and hanging that from the wall. Another solution is to utilize a pegboard for your larger items as well, as they can hang from hooks similarly to smaller items.
The small touches make a difference. Some outdoor storage buildings come with French doors or cupolas. You, yourself can add touches such as window boxes, shutters, or weathervanes. Remember, you'll have to look at this outdoor storage building every day of your life for the foreseeable future: Your attention to detail could make the difference between eyesore and eye-opener. On a more practical note, purchase or build a pressure-treated ramp for easy access to your outdoor storage building.