While you are a ghoul, you can turn the glow on the daily dungeon holograms on and off. This is obviously unintended..just look at the name after mouseover (Doodad_ET_Holographic_Stand01). Hopefully someone can branch off of this idea and find something epic.
Before:
ImageShack - Hosting :: beforein9.png
After:
ImageShack - Hosting :: afteroc5.png
Edit: Sorry for the huge filesize. Didn't have time to edit it or anything (FRAPS's files are huge!)