Text art pictures created with basic keyboard characters in fixed width fonts. http://asciiartist.com
Curated by Laura Brown
The site comes up 404 but I found it through the Wayback Machine. The actual plugin is still on WordPress.com but not updated in years.
WordPress minimalist - ASCII themes
2 columns, right sidebar, no images, widget ready, WP 2.2 compatible
I haven't tried it. But I wonder if it would show ASCII art without changing the font and mucking up the formatting.