Have a look through the project section
There are a bunch of ideas on there, A very good use and a recent one was @ODaily Magic Tool Box Project
There have been a few people connecting their xAC to key fobs, including @amal, that he explains the process in his book
( Now I sit back and wait for my commission on my plug 
)
Pretty much anything you can switch with a relay you can control with you xAC.
xEM/ NExT - xAC - RELAY - THING DOING STUFF!!
Have a look on YouTube for relays switching, and you should get some more ideas