The best way to design your wall interior depends entirely on the room in question. It is not a rule that applies to all rooms, only those that have visual appeal and that are aesthetically pleasing to look at. The best way to design a wall interior in any room is to decide which part of the room you want to feature, and then work out how this can be achieved with the wall space available. Once you have visualised the way things would look in your new room, you then need to get a professional interior designer to help you make these ideas a reality. An interior designer will provide you with ideas and suggestions as to how things should look in your new room, and they can help you think about colour, theme, space, lighting and so on. It is advisable that you go for professional help when you are beginning to think about the best way to design your wall interior because the last thing you want to do is to try and do a DIY job and end up making mistakes.