temporary wall additions
It may depend on where you live, but I know when I was in college I was almost never allowed to paint (or do anything, really) to the walls of my rented apartment. Therefore, it’s really all about temporary solutions to bare, bleak walls. Here, for example, all one would need to do is buy some shiny paper from a craft store, cut out some dots, and bam! Really neat, interesting and affordable wall design.
Worth Taking Note: There are so many variations on this that it’d be impossible to list them all here, but for the busier (or lazier) student there are tons of cool hanging murals and decals available online, or even a thrifted blanket or rug with a great design will do the trick. To look more upscale, try seeking out wall hangings with geometric patterns or abstract art rather than ones that display, say, a single musician or cats. (But if the latter is your fancy, we won’t stop you).