Image 2 Wallpaper is a free Android app, which can freely adjust or resize your favorite wallpaper to fit your Android device screen. P.S. [This tutorial is ONLY for those who cannot match position of wallpaper and widget or cannot fit wallpaper, if you do not have this issue, you may just ignore this tutorial]
First download Image 2 Wallpaper from Google Play Store for free: http://goo.gl/6wkS2
After downloaded, open app and choose Advanced Mode. then you will be asked to pick a wallpaper.