If you're space is neutral or you just don't want too much color around and you're lucky enough to have a pocket door, try containing an accent color by painting the door. When it's open no one would ever suspect, and when it's closed, pow! A bright swath of color.
SarahC pointed out how great pocket doors can be for small spaces since they take up very little room and literally tuck away. Painting one is a great way to get your feet wet with accent colors since, if you don't like it, it's not a hug space to repaint. We even wonder if you wouldn't want to try covering it in a great fabric or wallpaper for an unexpected detail. This bright pink door is from the Ikea catalog from earlier in the year!