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$scheme = $cookies{'skin'}
        ? ( ( param( 'scheme' )
...
          and param( 'scheme' ) =~ /^\w{1,6}$/ )
            ? param( 'scheme' )
            : 'default' );

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use strict;
use warnings;
...
print ttd( undef, 3);
print ttd( undef, 333);
print ttd( 6, 7);

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(yellow,blue):  yellow
(green,undef):  green
...
(undef,3):      3
(undef,333):    5
(6,7):  6

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$scheme = $cookies{'skin'} ||= param( 'scheme' )
                            && param( 'scheme' ) =~ /^\w{1,6$/
                             ? param( 'scheme' )
                             : 'default';

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$scheme = $cookies{'skin'}->value ||= param( 'scheme' )
                                   && param( 'scheme' ) =~ /^\w{1,6$/
                                    ? param( 'scheme' )
                                    : 'default';

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$/  =  q#(\w)#  ;  sub  sig { print scalar reverse  join  ' ',  @_  } 
+ sig
map { s$\$/\$/$\$2\$1$g && $_ } split( ' ', ",erckha rlPe erthnoa stJu
+" );