Beau Smith writes:
Ever thought about radically changing the look of your blog without much design work? Are you a designer who likes to work in semantic HTML and do amazing things with CSS? Maybe you’re moving from WordPress to Movable Type and want to keep your current design. Sandbox for Movable Type may just be what you’re looking for.
To install the plugin in Movable Type 4.2, it requires PHP set up on the server (pretty common) in order to generate dynamic CSS classes. The plugin is available to download now.