<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> I have two proposals, for light and dark background, respectively.<br> <br> <tt>#DFFFDF<br> #FFDFDF<br> #DFFFFF<br> #DFDFFF<br> #FFFFDF<br> #FFDFFF<br> <br> #600060<br> #006060<br> #600000<br> #606000<br> #000060<br> #006000</tt><br> <br> By that order. High color contrast between neighbor s-expressions (for distinction) and low brightness contrast (for eyes.) If more than six colours are needed, rotate. <br> <br> <table id="table1" border="0" height="83" width="295"> <tbody> <tr> <td bgcolor="#dfffdf"><big><big><tt> Texts</tt></big></big></td> <td bgcolor="#ffdfdf"><big><big><tt> Texts</tt></big></big></td> <td bgcolor="#dfffff"><big><big><tt> Texts</tt></big></big></td> </tr> <tr> <td bgcolor="#dfdfff"><big><big><tt> Texts</tt></big></big></td> <td bgcolor="#ffffdf"><big><big><tt> Texts</tt></big></big></td> <td bgcolor="#ffdfff"><big><big><tt> Texts</tt></big></big></td> </tr> </tbody> </table> <br> <table id="table1" border="0" height="86" width="295"> <tbody> <tr> <td align="center" bgcolor="#600060"> <font color="#ffffff" face="Lucida Console">Texts</font></td> <td align="center" bgcolor="#006060"> <font color="#ffffff" face="Lucida Console">Texts</font></td> <td align="center" bgcolor="#600000"> <font color="#ffffff" face="Lucida Console">Texts</font></td> </tr> <tr> <td align="center" bgcolor="#606000"> <font color="#ffffff" face="Lucida Console">Text</font></td> <td align="center" bgcolor="#000060"> <font color="#ffffff" face="Lucida Console">Texts</font></td> <td align="center" bgcolor="#006000"> <font color="#ffffff" face="Lucida Console">Texts</font></td> </tr> </tbody> </table> <br> <br> <br> <br> </body> </html>