Do you have any other colors in your bathroom? White or colored suite? Or colored tiles? Do you already have a color theme with towels? shower curtain? accessories etc?
If you don't already have color constraints in your bathroom (or only white?) then your color choice is much larger.
What you might want to consider, though, is flooring in the rest of the house.
Can you get a flooring that looks good next to the flooring you already have in adjoining rooms?
Try and choose one that compliments in color, style and texture - for example, if you have a traditional or period style smooth flooring in the rest of the house/adjoining room, a traditionally styled, smooth floor would suit best here as well.
Having said this, in bathrooms I think you can get away with a drastic style change if you want, as the bathroom is normally kept more 'shut off' from the rest of the house.
Carpets are never advisable for bathrooms, it tends to look somewhat old fashioned, can collect damp and stains, and always has the suspicion of being unhygienic, even if its nothing of the sort.
Choose waterproof flooring for a bathroom, that means vinyl, tiles, waterproof laminate or treated wood, cork or bamboo. Look on the packets for which room in the house the flooring is suitable for, if you are buying your own.
Pale floors can make your room feel larger, but may be difficult to keep clean - dark floors can make your room feel smaller, but can add a nice touch of color and interest to an all white room, and while they won't show dirt so much, they may show dust and/or pet hairs.
So there are lots of options to go for - why not have a look round a large DIY store, and get some ideas for what takes your fancy.
