This is our second app giveaway today – we published earlier our Popsiclor app giveaway, if you missed that you can read about it and enter here. But, as it’s such a special day in the US we really wanted to share this app with all our readers too. This giveaway is for the American Wallpaper App – each worth $0.99/£0.69. This app will allow you to add a brand new patriotic background and wallpaper theme to your iPhone. There’s plenty of stars and stripes, national flags and of course Uncle Sam. So would you like to try it for free? If so, like us on Facebook (see bottom of…