One of the things I’ve done with my website is design and add an entirely new design, and the ability to switch between the current design and the new one. Check it out!
The “Dark” style is the current one, and the “Light” style is the new one. I’m really pleased with how it turned out, design-wise, even apart from managing to implement a style-switcher that stores the current selection in a session cookie so it’s remembered next time you visit. 😀