Smart Photo Widget is the best photo widget on the App Store, and the last one you'll ever need.
There are two types of results you'll get from all of the other photo widget apps out there:
Using Smart Photo Widget, simply choose a photo folder and install the widget and you're done. Smart Photo Widget does all of the work for you and frames each photo perfectly and rotates through your best photos throughout the day.
Give Smart Photo Widget a try and see that it really is the easiest to use photo widget app on the iOS and Mac App Stores by far.
Smart Photo Widget is free to download. The free version provides one photo collection for free. There is a one-time in-app-purchase that unlocks an unlimited number of photo collections, handy overlays, photo filters, and more.