When it comes to personalizing an Android smartphone, sky's the limit as to what can be altered. The platform allows for deep customization of pretty much everything, both under the hood and on the visual side. And if you've also grown tired of the stock look and feel of your Android handset, then you've come to the right place. Here we've put together a selection of Android personalization apps – apps that can modify the way one interacts with their phone or change the way Android's UI looks. Best of all, many of them are free or have a free version that can be tested before purchasing the full app. Give them a try and tell us what you think down in the comments!