Case modding runs the gamut from mild to wild. Some folks (like me) just like to have a really neat case inside. All cables zip tied out of the way, power wires zip tied together and things of that nature. I used to also cut the stock perforated grills off the cases and replace them with standard wire grills...I don't bother anymore.
My cases sit under my desks...so no need for windows. I do admire those who go all out....one case stands out...
The guy that built the black, plexi case with all kinds off different neon in it...he had some kind of Biohazard symbol on the front that lit up a different color than the rest of the case...awsome. The case was gloss black, with the neon off, but w/the neon on, the case was see-thru neon blue. Sharp.