There was a point recently when I was avoiding exploring my interest in urban design and planning, because I thought that it was impractical unless I wanted to deal with a field that seemed filled with bureaucratic obstacles. This month I learned that there is such a thing as tactical urbanism, where citizens take urban and environmental design into their own hands. This company Street Plans is a great example. I'm feeling pretty excited to explore this area some more.
Similar to architectural visualisation, I think it would be fun to design interior design renderings. My imagination is already running rampant visualizing surreal designs for kids' bedrooms.