There is literally thousands of different colors, different patterns even different types of wallpaper. How do you know which color, or which pattern will suit it's surroundings the best? Read on, and you will have a good idea!
Color or Pattern - This for the most part is a personal chose; However there are simple things you can do to choose a color or pattern that will actually work. If you like the hot pink wallpaper and the rest of your house is done in marble I would recommend shying away from your personal preference and going with something that is going to last and add value to your home not take away from it. There are several guides that can help you pick colors that match it's surroundings and that fit in. A simple rule is choose like color's and tones. For example if your thinking green, and the opposite wall is maroon. Choose a green that is the same tone as the maroon. Don't pick like glossy shiny green, when the maroon is a dull light shade.
Types - Several different types of wallpaper exist, and a lot of this choice is going to depend on it's application, and your budget. For example Vinyl wallpaper is very durable and is perfect for rooms like kitchens and bathrooms as it can be scrubbed, and will not hold stains. Vinyl-Coated Wallpaper is just like Vinyl Wallpaper however it is not quite as durable and will hold stains. Can you see how the difference between these two styles is going to make a big difference in placement. You might think that having a really expensive custom wallpaper in your kitchen is desirable but when your toddler flings some spaghetti sauce on it, and it stains, you are going to be wishing you had chosen something more practical.
This is only meant to be a rough educational guide on wallpapers. There are several aspects of wallpapers that I didn't cover. I recommend talking to a professional at a wallpaper store, when it comes time to re-decorate your house. Make sure to ask lots of questions as wallpapers will last time if chosen wisely.