How many times did you use the Blender Game Engine to produce interactive architectural visualizations? A lot of architects and artists using Blender doesn’t know that they can actually create high quality presentations for architecture, by using something like a 3d game, to allow their clients to interact and walk around their projects.
And besides architectural visualization, we may be asked to be part of a game production team, working with the modeling and texturing of scenarios. At the college where I teach, one of the classes is exactly about the creation of 3d sets for games. If you want to check out a great place to get textures prepared for games, and interactive presentations go check out Open Game Art. They have a hand full of textures prepared for games.