DIY Storage Bed Frame - best use of space of your room. If you have basic power tools (circular saw, drill machinery, electrical screwdriver) and know the basic woodworking skills, you could get the job done by yourself in just a weekend.
Interesting idea for kitchen and dining room. Island with a bench seat attached for the table. Might have to do something similar in my new place to save room for chairs. Under the bench seat could be storage for rarely used items.