1- Have the fuel figures and landing info sent to ground handling via SMS at Captain's own expense using the onboard ONAIR system (I guess it's .5 euro cents each message multiplied by approximately 600 flights a day it should come out with an approximate 110.000 euros/year).
2- Get rid of cleaners at the end of the day and just use the last crew to land to deep clean the aircraft since duty times end at blocks on and crew could be legally used for a couple more hours (cleaning products to be bought at own cost of course)
3- Have the Captains doing mandatory PA's advertising scratch cards and bus tickets to improve sales (we all know that the Captain's authoritative voice could do the trick).
4- Sandwiches and pizzas to be prepared by cabin crew at home in their own time and at their own expenses and to be sold onboard with the money going to FR
5- Pilots to invite kids into flightdeck after flight to make pictures and videos of them at a cost