The playground

Bjorn's photo-MORPH-studio

Create morphing photos

Add-on for Google Docs and Google Slides.

Swiftly create "morphing" photos from pics in your Google Photos albums.

Add any number of photo frames.

Generates GIFs that can be used as Slide backgrounds or inserted as eye-catching image boxes.

(OK, there is no real morphing going on, instead changing transparency (fade out/in) is used as a transition effect)

Choose from three transition effects: fade, slide and push.

Supports drag and drop of photos from local hard drive.

Check out this short YouTube video of the Google Sheets version.

Check out screenshots and install from the web store.

Have a look at the Google Sheets version.

There is also a web app version of this add-on.