Regardless of any bathroom design ideas you have, the real deciding factor is the kind of bathroom you have already. There are plenty of features you might like but that doesn't mean they will be suitable for your bathroom.
The style of your home as a whole can also provide inspiration for bathroom design ideas. And more to the point, your bathroom has to fit in with the interior decoration of the rest of your home. If you have a traditional look to your home, state-of-the-art design might not sit well in your bathroom, no matter how much you covet those modern appliances. Similarly, if you have a very contemporary look to the rest of your living space, a rustic style for your bathroom will be incongruous. But, hey, if it's time to update the whole of your home, feel free to start at the bathroom and work your way from there!