My own take on GrayZone theme for LimeChat.

GrayZone.css

html {
  font: 13px/1.3em 'Lucida Grande' sans-serif;
  background-color: #eee;
  color: #333;
  word-wrap: break-word;
  margin: 0;
  padding: 0;
}

body { 
  margin: 0;
  padding: 3px 4px 5px;
}

/* the html tag has these classes and attributes too */
body.normal {
}
body.console {
  background-color: #ddd;
  font-size: 0.9em;
  line-height: 1em;
}
body[type=channel] {}
body[type=talk] {}
body[type=console] {}
body[channelname=#limechat] {}

hr { margin: 0.5em 2em; }
a { color: #a33; }

/* lines */
.line { margin: 0 -4px; padding: 0 4px 1px 4px; }
.line[alternate=even] {}
.line[alternate=odd] {}
.line[type=action] {
  color: #777;
}
.line[type=action] .sender:before {
  content: "~ ";
  white-space: nowrap;
}
.line[highlight=true] {
  background-color: #eea;
}

.url { word-break: break-all; }
.address { text-decoration: underline; word-break: break-all; }
.highlight { color: #a33; font-weight: bold; }
.time { color: #555; font-size: 0.9em; margin-right: 1ex; float: left; }
.place { color: #555; }

/* nickname for text messages */
.sender[type=myself] { color: #555; font-weight: bold; }
.sender[type=normal] { color: #333; font-weight: bold; }
.sender[type=normal][colornumber='0'] { color: #033 }
.sender[type=normal][colornumber='1'] { color: #699 }
.sender[type=normal][colornumber='2'] { color: #f33 }
.sender[type=normal][colornumber='3'] { color: #f60 }
.sender[type=normal][colornumber='4'] { color: #3D3242 }
.sender[type=normal][colornumber='5'] { color: #6600CC }
.sender[type=normal][colornumber='6'] { color: #2C6700 }
.sender[type=normal][colornumber='7'] { color: #154890 }
.sender[type=normal][colornumber='8'] { color: #6B78B4 }
.sender[type=normal][colornumber='9'] { color: #E47297 }
.sender[type=normal][colornumber='10'] { color: #0064FF }
.sender[type=normal][colornumber='11'] { color: #00CAFE }
.sender[type=normal][colornumber='12'] { color: #003366 }
.sender[type=normal][colornumber='13'] { color: #834C24 }
.sender[type=normal][colornumber='14'] { color: #1F1209 }
.sender[type=normal][colornumber='15'] { color: #ff00ee }

/* message body */
.line[type=myself] { color: #555;}
.line[type=reply] { color: #a33; }
.line[type=privmsg] {}

.line[type=system],
.line[type=error], 
.line[type=error_reply],
.line[type=dcc_send_send],
.line[type=dcc_send_receive],
.line[type=notice],
.line[type=join],
.line[type=part],
.line[type=kick],
.line[type=quit],
.line[type=kill],
.line[type=nick],
.line[type=mode],
.line[type=topic], 
.line[type=invite],
.line[type=wallops],
.line[type=debug_send],
.line[type=debug_receive] { 
  font-size: 10px;
}
.message[type=system],
.message[type=error], 
.message[type=error_reply],
.message[type=dcc_send_send],
.message[type=dcc_send_receive],
.message[type=notice],
.message[type=join],
.message[type=part],
.message[type=kick],
.message[type=quit],
.message[type=kill],
.message[type=nick],
.message[type=mode],
.message[type=topic], 
.message[type=invite],
.message[type=wallops],
.message[type=debug_send],
.message[type=debug_receive] { 
  color: #777;
}
.message[type=error] { color: #e00; font-weight: bold; }
.message[type=error_reply] { color: #f00; }

/* mIRC color effects */
.effect[color-number='0'] {}
.effect[color-number='1'] {}
.effect[color-number='2'] {}
.effect[color-number='3'] {}
.effect[color-number='4'] {}
.effect[color-number='5'] {}
.effect[color-number='6'] {}
.effect[color-number='7'] {}
.effect[color-number='8'] {}
.effect[color-number='9'] {}
.effect[color-number='10'] {}
.effect[color-number='11'] {}
.effect[color-number='12'] {}
.effect[color-number='13'] {}
.effect[color-number='14'] {}
.effect[color-number='15'] {}
.effect[bgcolor-number='0'] {}
.effect[bgcolor-number='1'] {}
.effect[bgcolor-number='2'] {}
.effect[bgcolor-number='3'] {}
.effect[bgcolor-number='4'] {}
.effect[bgcolor-number='5'] {}
.effect[bgcolor-number='6'] {}
.effect[bgcolor-number='7'] {}
.effect[bgcolor-number='8'] {}
.effect[bgcolor-number='9'] {}
.effect[bgcolor-number='10'] {}
.effect[bgcolor-number='11'] {}
.effect[bgcolor-number='12'] {}
.effect[bgcolor-number='13'] {}
.effect[bgcolor-number='14'] {}
.effect[bgcolor-number='15'] {}

GrayZone.yaml

# All colors must be in the form of '#rrggbb' or '#rgb'.
# You cannot use color names.

log-view:
  nickname-format: '%n: '
  scroller-highlight-color: '#a33'
input-text:
  font-family: 'Lucida Grande'
  font-size: 13.0
  background-color: '#eee'
  color: '#333'
member-list:
  font-family: 'Lucida Grande'
  font-size: 11.0
  color: '#333'
  background-color: '#ddd'
  operator:
    color: '#700'
  selected:
    color: '#eee'
    background:
      top-line-color: '#eee'
      bottom-line-color: '#eee'
      top-color: '#333'
      bottom-color: '#333'
server-tree:
  font-family: 'Lucida Grande'
  font-size: 13.0
  background-color: '#ddd'
  highlight:
    color: '#3a3'
    background-color: '#eea'
  newtalk:
    color: '#333'
  unread:
    color: '#800'
    font-weight: 'bold'
  normal:
    active:
      color: '#333'
    inactive:
      color: '#666'
  selected:
    active:
      color: '#eee'
    inactive:
      color: '#aaa'
    background:
      top-line-color: '#eee'
      bottom-line-color: '#eee'
      top-color: '#333'
      bottom-color: '#333'