New tileset: Geoduck UnNetHack Tile Set Version 1.0
It is a compact ASCII-derivative tileset with a width of 12 and height of 20. There’s also a simple 2x scaled version available.
You can download it and other tilesets for Vanilla NetHack and Slash’Em at http://cook.web.eschelon.com/nhack.html.
Here is an example screenshot of an UnNetHack tourist in Mine town:
You can also look how various tilesets (including Geoduck’s) look like on Pasi Kallinen’s NetHack tileset screenshots page.