Modifications and Add-Ons Graphics
You have found the way to Graphics on Modifications and Add-Ons:
The Absurd NetHack Tileset - Oversized graphic files, release notes, and resource links.
Big NetHack Font - Custom BDF font for X11. Screenshots, installation guide, and related links.
deviantART - 12x20 Tileset - In-progress graphics of reduced dimensions. Screenshot and file downloads.
Fit To Screen Tileset - Pared down graphics for Microsoft Windows. Development and usage notes, screenshots, and resource links.
Itakura's 32x32 Tiles - Sample graphics, notes, and Microsoft Windows tile generation utility. Help build the largest human-edited directory on the web.