3D Minecraft textures are an interesting concept that has been explored a lot. However, some of the best 3D texture packs in Minecraft require a very beefy computer due to the sheer amount of detail.
Google Play is the most common and most used website for downloading free Android apps. It's free, it's fast and it's efficient. You can not only use it from your android mobile but you can also operate it and download apps using your laptop.