Last night, WordPress DC (which, if you live in/near Washington, D.C. and love WordPress, you really must join) held a round of lightning talks covering a range of WordPress and WordPress-related topics.
I gave a quick five-minute talk on some stupid Sass tricks you can do, including changing the entire color scheme on a page just using one hex color and a whole bunch of Sass color functions. Then I demoed how you can create odd grid systems by again, modifying only a handful of variables.