Bathroom floor tiles should none slip. They will have a slightly rougher finish than the normal, glazed floor tiles.
As for the rest of the house, surely that's just a matter of taste and budget.
Just pick the colour or pattern that you like, preferably ones that will match the rest of the house.
For example, what color are the walls painted, what color curtains do you have?
The tiles need to fit in with the colour scheme of your house.
Also, you will need to know how big the rooms are in a square meters so that you know how many boxes to order.
And don't forget tile cement and grout.