This is a color theme for the Lem ediitor.
It uses Solarized palette to define light and dark themes:
(unless (member "ultralisp" (ql-dist:all-dists)
:key 'ql-dist:name
:test 'string=)
(ql-dist:install-dist "http://dist.ultralisp.org/"
:prompt nil))
;; Load the extension
(ql:quickload :lem-solarized)
;; Enable the theme
(uiop:symbol-call :lem-solarized :solarized-light)