It may not be an official Instagram app for our Windows Phone, but Instagram Lockscreen does bring the popular photo sharing service to your Windows Phone 8 device.
As you would guess, Instagram Lockscreen lets you set your lockscreen wallpaper with images from Instagram. You can choose image feeds by your favorite Instagram member, your favorite hashtag or just set it to your own Instagram images.
Now for the downside of things... you can't use Instagram Lockscreen to create an Instagram account (you'll need to do that from an Android or iOS device) and the app does not have a trial version. Instagram Lockscreen is currently running $1.29 and you can find it here at the Windows Phone Store.