[msbmsb]

I did the same thing. Tag next to the entry-way light switch for changing to an "at-home" profile, tag next to the bed for switching between night mode and morning mode, tag at work, keychain tag for switching between car mode and quiet mode.

And profile switching is just the basics. You can have a tag that connects guests' NFC-enabled phones to your wifi without having to hand out the password, for instance.

NFC task launcher + tasker is an amazing combination that opens up all kinds of possibilities.