Chemical Words is a web app for drawing words from the periodic table.
Click here to try it!
Back when I lived in Whatcom County, I saw a t-shirt that spelled "WWU Chemistry" in the style of the periodic table. So, I decided to throw together a DHTML program to spell an arbitrary phrase this way, even using upside-down letters if necessary. The algorithm prefers two-letter combinations to one letter, to make it more fun.
I wrote this in 2005. Back then, Internet Explorer was the only browser that could render text upside down. By now, other browsers have added their own extensions like -webkit-transform, and so I've added cross-browser support.