Same. Sprig of wattle in silhouette would be nice. Don't think it would need to specifically reference SF - but if the consensus was to do this, a more subtle way would be to 'stack' SF or even SFAM like, say, the Carlton insignia... Positioning on the front of the back blade would be best, because you could decide to have it partially visible of entirely obscured depending on how you wear the blade. A plain bugundy grenadine (or something like that) is both wearable, but also unusual in AUS, so it would be distinctive (which is what you want in a club tie - ie so you can recognise other members). A repp would also work, of course.