For a brief, crazy minute (or minutes), I may have even thought about using a Sharpie to make the "L" and "R" much bigger, but then my craziness would be on display to everyone I walk by on my morning commute. That just won't do.
What will do, however, are these sweet Earbud Caps ($10) from Etsy, with the "L" and "R" elegantly printed on each cap. When cute and useful combine like this, I can hardly stand it. Etsy seller nothingelegant, you are a genius.