These, however, are two super-simple, load-and-forget plugins, whereas janitor is a bit more versatile and complex.
When a team captures a flag, skyColorCTF and mirrorCTF will change the sky color and mirror (respectively) to the color of that team. For instance, if Red team capures a flag, the sky and/or ground (depending on which ones yo use) will turn red.
If a player captures his or her own flag, the sky/mirror will turn black.
These plugins are just a quickie, but a neat effect I thought would be worth having. Enjoy.

EDIT: Credit also goes to Meacan, who according to Trop was the first person to come up with this idea.