FYI: Recently, Wikispaces rolled out some new themes. Go to your wiki’s Manage Wiki page. In the Settings row click Look and Feel. Under Theme click the link to Change or make a new theme. You will find 12 choices. Click the Preview button to see what your wiki will look like with a particular them. Click the Apply button to use that theme.
The Notebook theme is fun, while Tatami is a very minimalist look. If I can get used to the menu being on the right, I will use the Glass theme.
Image Credit: Wiki wiki mart by Andjam79 Lincensed CC: Attribution