Neatorama loooves ambigrams (what? Look it up [wiki]). Naguib and Fadilah of Nagfa blog just happen to have some of the neatest examples around. I particularly like this creative Kermit The Frog ambigram!
Check out the blog's ambigram challenge, where you can submit your own ambigrams (right now, the phrase is "shark attack"). There are already 44 very creative entries.