Here are some tiny bits of code to generate some amusement and aesthetic value.
The album sc140 features 22 tracks, each one generated by no more than 140 characters of SuperCollider code. You can download 80 MB of MP3 (for the weak!) or grab the source code (less than 4 KB, with all the formatting) and, if necessary, install SuperCollider, which is free in every sense. Here’s a November New Scientist blog post about the album.
On the visual and literary side, check out Pall Thayer’s Microcodes, tiny art pieces in Perl. Thayer also offers a PDF guide to the appreciation of tiny programs. Some of Thayer’s program incorporate play with the human-legible dimension of code; “WAR has NO value,” now on the front page, is a simple and nice example of this.