Memorylage is a photography app for your Windows Phone 8 device that lets you view your photo albums in collage style, create collages, share your photos and use them as your lockscreen collage-styled wallpaper. It's a nice alternative to the native Pictures Hub and was recently updated to version 1.2.
The update brings a handful of new features and performance tweaks. Lockscreen collages can now be automatically generate (you can still manually create them) and updated periodically from your collage library. You can now adjust the margin between images and select which photo albums you want the collage generator to pull the photos from.