Fly – Lightweight WordPress Blog Theme. A really simple and very flexible WordPress theme. You want the sidebar to go right? It goes. You don’t like the background color? No problem, you can change it, and you can chose from all the colors in the world. Well you can change almost any color there is: the link color, the text color, the page color. It’s really simple, you just have to use the built-in settings panel on the theme options page.