I grew up in Texarkana actually. When they closed the Grim Hotel, I did a photo essay on what it had become that accompanied a news piece commemorating it's "life". I always thought that it's name had potential for something though. So, over a decade later, I pulled out some photos and messed with them a little bit in photoshop. So I suppose the answer to your question is Yes, that's where it's from.
<A HREF="http://hotelgrim.keenspace.com" TARGET=_blank>Hotel Grim</A>, the comic with reservations.