Italian company for glass and stone finishes Trend Group, has developed an interesting iPad App for interior design, called iTrend. You can easily make changes to rooms after you capture them with iPad camera. Elements on which you are able to work are floor and walls. As you can see from the video below, the application has enough tools and it is relatively easy to achieve good results in visualization of your ideas.
See how to work with iTrend and if you like it you can download it from Apple App Store.