You have the wrong concept of modding.
Mod is short for Modification.
Modification means "the action of modifying something." or "a change made.".
So you've changed the fans so it's a change thus modding? No.
Modding a case means changing the actual structure of the case.
Like how would you incorporate a slim optical drive into an H440 or how would you would allow the fans in a 900D to take in more fresh air.
Adding LEDs to a case is not changing it's structure thus it's not modding.