Some of the answers to the above questions will begin to guide you in which direction of tile you should be looking for.
Will your tile be across all walls in the bathroom including the shower area? If yes, you need to be sure that you like your tile choice, as you will be seeing a lot them. Are you buying tiles only for your shower area? If you are – why not be bold with your choice and choose a punchy pattern tile to raise the colour and character of your bathroom.
What colour scheme is your bathroom furniture? If you try and use the same colour be conscious everything could become too similar, conversely you should be aware of potentially creating a clash of colours. What style is your sanitary ware? Sleek, minimalist sanitary ware is fantastic. Traditional, big rounded sanitary ware is fantastic. However, if you pair the wrong style of tile with the wrong style of sanitary ware with the wrong style of tile, your bathroom could be a big jarring mismatch. And you do not want that!