I also put a small shelf I'd bought on the wall. I bought the shelf for the displaying of a bunch of my Star Wars spaceships.
I put them on the same wall, and it is awesome.
You might think that Welsh myth and Star Wars ships don't really go together, but it's my library and I say, they do.
Oh, and here's a cool detail: a part of the poster depicts King Arawn at the hunt with his hounds. Check it out: they're greyhounds!
This led me to look up greyhounds as hunting dogs, which it turns out, they originally were...and that led me to introduce a new character to The Adventures of Lighthouse Boy. This is the first time I have ever directly based a character in a story of mine on someone I know in real life. So, if ever I get this enormous tome of a novel finished, you'll get to read (at least in part) the adventures of Storm, the hunter-greyhound of Clan Talonhearth! Based on Cane!