@xtech, I just played a bit and you can use like that, if you want, without any custom CSS, etc.:
{{if settings.clubsenhancementsShowPostBadge}}
{{$theClubs = \IPS\Member\Club::clubs( $comment->author(), NULL, \IPS\Settings::i()->clubsenhancementsShowPostBadgeDisplay, TRUE );$clubCount=count($theClubs);}}
{{if $clubCount > 0}}
{{$cont = 0;}}
<div class='ipsAreaBackground ipsPad ipsType_center ipsSpacer_top'>
<div class="ipsType_normal ipsType_center ipsSpacer_bottom"><a href='{$comment->author()->url()->setQueryString( 'tab', 'clubs' )}'>{lang="my_clubs"}</a></div>
{{$order = \IPS\Settings::i()->clubsenhancementsShowPostBadgeDisplay;}}
{{foreach \IPS\Member\Club::clubs( $comment->author(), NULL, $order, TRUE ) as $club}}
{{if $club->canView()}}
<span data-ipsTooltip title='{$club->name}'>{template="clubIcon" group="clubs" app="core" params="$club, 'tiny'"}</span>
{{$cont++;}}
{{if settings.clubsenhancementsShowPostBadgeNr > 0 AND settings.clubsenhancementsShowPostBadgeNr == $cont}}
{{break;}}
{{endif}}
{{endif}}
{{endforeach}}
</div>
{{endif}}
{{endif}}
Results:
Or even with a darker background:
The user Mary Doe isn't member of any club so it doesn't appear.
My Clubs is linked to the Clubs tab in user profile.
Guess I will use it.