How about a landscape in the background with the edge of a kilt and knee and top of hose in the foreground (off to one side of the pic)? It would give you an opportunity to practice tartans and maybe a kilt pin and sgian dubh top.

I also really like Jock's Castle idea. I am partial to Urquhart castle (on Loch Lomond) or Castle Stalker (Stewart castle near Ft. William).