I spy with my little eye something beginning with?

We've all played the classic children's game and probably not just as children. Nothing else says I'm bored shitless than someone breaking the silence with "I spy with my little eye? Followed by an argument on whether it's a cup or a mug.

But I'm curious as to what the most common letter is, so based on where you are now and what you can see what letter would you pick?
I spy with my little eye something beginning with?
Updates
+1 y
Bonus question. What in the picture begins with R? I honestly don't know.
I spy with my little eye something beginning with?
Post Opinion