If the faucets are in vanities or kitchen sink cabinets, leave the doors to the cabinets open all the way. It lets more heat from the room get to the pipes. With the doors closed all the cold coming off the wall is trapped inside the cabinet.

You can get those little electric heaters for like 15-20 bucks. You just need to be safe with them. Keep it far away from things that could catch fire and don't use extension cords. Also just buy the cheapest one they have because electric heat is 100% efficient. A $300 electric heater that is 500 watts will put out the exact same amount of heat that a $20 electric heater that is the same 500 watts does.