$frame->LabEntry(
    %{$colors{lbl}},
    -other_opt => 'other_value',
    -background => 'non_default_colour'
);

##</code><code>##

$ perl -Mstrict -Mwarnings -e '
    my %colours = ( lbl => { "-background => tan, -foreground => black", } );
'
Odd number of elements in anonymous hash at -e line 2.