Script iset.pl has been improved. Now you can setup colors for option names, types and values. And null values are displayed with different color (for IRC server options). There's new config options, you can set with /set command:
/set plugins.var.perl.iset.colorbgselected color
/set plugins.var.perl.iset.color_option color
/set plugins.var.perl.iset.coloroptionselected color
/set plugins.var.perl.iset.color_type color
/set plugins.var.perl.iset.colortypeselected color
/set plugins.var.perl.iset.color_value color
/set plugins.var.perl.iset.colorvalueselected color
/set plugins.var.perl.iset.colorvalueundef color
/set plugins.var.perl.iset.colorvalueundef_selected color
A screenshot is better than long speech:
Updated on 2017-06-26: the script is now obsolete, replaced by the builtin fset plugin.