Being that you spend about one third of your life in your bedroom, or more specifically in your bed, you will want to make sure that your bedroom looks as calming and relaxing to you as possible, with the possible exception of a student living away from home - in which case you may be too busy and active socially to really care that much about your bedroom.
For those that do care about the look of their bedroom, one of the first things you will need to take into consideration when considering bedroom furniture decoration is what type of mood is currently set by your bedroom, and how you want the mood to be affected by the new furniture. So if you're happy with the current mood of your bedroom, and would like more earthly kind of feel to it, then opting for natural oak or natural pine wood wardrobes and bedroom furniture will be fine for you. On the other hand if you are looking to brighten up your bedroom, then you will want to get some painted furniture - typically you can get painted furniture in white, cream, or ivory. And for more select tastes, or for children's bedrooms, you can also get furniture painted in other bright colors too.
Also for bedroom furniture decoration consider the style of furniture that you want. For example with wardrobes, you can get a wardrobe with a single door, or a double sized wardrobe with two doors, or triple sized wardrobe with three doors. What sized wardrobe you get will of course be dictated by how much clothes and other accessories you need to store away. And also you may like to consider a wardrobe with sliding doors if that style of furniture particularly takes your fancy.
Whatever type of wardrobe you get, and other bedroom furniture, you will want to make sure that you have done your measurements properly and thoroughly. There is nothing worse than getting furniture that is larger than can be comfortably accommodated in your bedroom. So make sure that you measure everything fully to ensure that you can put your furniture in and utilize it without feeling like you have been cramped into a tight space, or constantly needing to shift other pieces of furniture and equipment in your bedroom to access a single piece of furniture.