These are the colors of the "desert" theme by Hans Fugal with a few small modifications (namely that I lowered the intensity of the normal white and made the normal and nontext backgrounds black), modified to work with 88- and 256-color xterms.
The original "desert" theme is available as part of the vim distribution or at
http://hans.fugal.net/vim/colors/.
The real feature of this color scheme, with a wink to the "inkpot" theme, is the programmatic approximation of the gui colors to the palettes of 88- and 256- color xterms. The functions that do this (folded away, for readability) are calibrated to the colors used for Thomas E. Dickey's xterm (version 200), which is available at
http://dickey.his.com/xterm/xterm.html.
I struggled with trying to parse the rgb.txt file to avoid the necessity of converting color names to #rrggbb form, but decided it was just not worth the effort. Maybe someone seeing this may decide otherwise...
Copy this file into ~/.vim/colors (or $VIM/vimfiles/colors in Windows). Start it from within vim using :colorscheme desert256.