Verizon Wireless is here to help forrest_canton. Being able to customize your device is the perks of having a smart phone. What make/model device are you using? What widget exactly are you trying to set up as a wallpaper? Please provide additional details so we may further assist and get clarification.
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A widget and wallpaper are two completely different things. That being said, you could use an app like Zooper widget to do a full screen widget with a picture of your choice in the background. They have a pretty good community on G+ with lots of good ideas.