Check your windows
Cold air coming in through a window (and warm air going out) results in a very cold bathroom.
Seal your windows by putting your hand around the closed window frame to feel where the cold air is coming in. Then, use self-adhesive foam weather stripping at the bottom and sides of the window to seal the gap.
This will keep your bathroom warm and help save money on your power bills.
Try a new coat of paint
Giving your bathroom wall a fresh coat of paint will not only make it look better, but also keep it warmer if you use high quality, heat reflecting, insulating paints.
And rather than going for traditional white and cream colours, consider a warmer colour instead.
Change your shower head
By installing a shower head that delivers less water per minute you can have longer showers to warm you up and still save money on your utility bills.
There's a wide range of water saving shower heads in different styles to suit your bathroom and most just screw onto the existing shower arm.