Acme::EyeDrops can pour code into almost any shape because it encodes the source into a uniform format that can be made to fit almost any shape. I don't see how this problem can be solved in the general case, however; the token print, for example, is too long to fit into a portion of a shape that is less than five characters in length.

Some random links that might be useful:

• Yet Another Obfuscation Engine. The converse of Acme::EyeDrops, this can convert any program into one that contains only letters (no punctuation).
• 3-D Stereogram, Self replicating source. I found this one fascinating but have no idea how to incorporate this idea into Acme::EyeDrops.
• Perl Spots
• Perl::Visualize. Encode Perl source into GIF images.
• Acme::AsciiArt2HtmlTable. Convert ascii art into a HTML table (this was discussed here in Add "Image Miniatures" to your HTML).