[grapeli23]

Perl is not needed.

URxvt.keysym.M-C-minus: command:\033]4;0;#333333\007\033]4;1;#cd3333\007\033]4;2;#33cd33\007\033]4;3;#cdcd33\007\033]4;4;#3333cd\007\033]4;5;#cd33cd\007\033]4;6;#33cdcd\007\033]4;7;#cdcdcd\007\033]4;8;#656565\007\033]4;9;#ff6565\007\033]4;10;#65ff65\007\033]4;11;#ffff65\007\033]4;12;#6565ff\007\033]4;13;#ff65ff\007\033]4;14;#65ffff\007\033]4;15;#ffffff\007\033]11;#101010\007\033]12;white

[pera]

Yeah, actually I first thought about writing a script to translates normal X resources color schemes into urxvt keybinding commands with escape sequences like yours, but then while I was reading the documentation I discovered that urxvt has support for pop-up menus, so I created this Perl extension instead.