A good workspace can take a theme to interesting places. Justin David Cox is a designer who works at a collective for creative professionals called Public School, and his desk embodies the style of the organisation.
All it took was a simple wooden desk, a class bell, some books and a chalkboard to put this theme together. While the bell might be hard to come by these days, everything else is readily available (or you may have it already). If you don't want to get an actual chalkboard, you can just paint one. You don't have to have a school theme, of course. You can choose any style you want. Justin's workspace is just one example of a well-executed theme.