This relies on the /usr/openwin/bin/showrgbcommand (I'm a Solaris user... I'm sure there are equivs in other flavors/desktop mgrs) and obviously the xterm command. Read your xterm man pages for other options that can be passed as well. 
#!/usr/bin/perl
use strict;
my @c=grep{s/\s//g;s/\d//g}`/usr/openwin/bin/showrgb`;
my $i=rand@c;
my $color=$c[$i];
exec("xterm -fg black -bg $color -font 6x13 -ls -sb -sl 1000 &");

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In reply to Random xterms in OpenWindows by insensate

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