This last one is obviously not an interesting or technically accomplished photo (and I'm not saying any of the other ones are either ), but I though it was pretty cool that this was hand drawn with a simple pencil. From an area that didn't allow photography, so just a quick shot.
I knew that's what you did! Well not yellow, but I had the feeling it was something like that. I have yet to find the perfect look for it with my photos when I put a layer on it like that. Looks to be yellow though.