Quote: "Who is the original creator of those meshes? "
As Sika Sina Games stated, they're included in a free Segment/Entity Maker that I released a while back (available on fps-files under the name "Model Maker").
Meshes that are made by others are stated in the Read Me.
Quote: "can't imagine where he got the idea from."
Do you know "Urban Exploring"? There a lot pictures of abadonded Asylums around the net, and a few have this similiar Wall Style... that's how the idea for the pack came.
Sorry Kravenwolf, If it looks like I stole your idea.
Oh, and like Wolf said, the Idea for a Asylum themed game exists since 2007... it was the first Project that I wanted to make with FPSC... but it ended up in an epic fail.