Swarkles Symbol?

[unzadi]

Okay, so, the yellow umbrella is the symbol for Ted and Tracy's love story, the blue French horn is for Ted and Robin. Ted, by himself, gets red cowboy boots. We see "suit," we think Barney. For Robin, it's a maple leaf/Canadian flag...but what image would we put to the B/R pairing?

I'm working on a fic tracker for my planner, and wanted to include an image that suggests or symbolizes the pairing, but drawing (no pun intended) a blank at the moment. Suggestions welcome.