I am no means called developer so be warned, I consider myself more like an android enthusiastic, so please don't ask me to make it work for your devices or telling me it does not work.
I have tested this on my devices (on Nexus 7 stock 4.4.2 and Samsung Galaxy Note 4.2.1) and it works on both, considering it works on two different devices, I am hoping it should work for most of devices.
Installation (root required):
Unfortunately, even if I tried to make this work as normal app install, i could not able to display the pictures (if you install as normal apk, photos does not display), so you need to push this apk to system/app folder and reboot to your phone and tablet.
I really liked this photoframe widget from Asus, that's why I am sharing with you guys. If it works on your device, a little thank you is more than enough.