We took static photos against a green background (but you could also take photos anywhere and use a tool like remove.bg to remove the background and save as transparent .png files...)
We then used the simple glide animation feature in WeVideo to move each photo in a different direction, and exported as a GIF!
The "animation" feature (under "edit") allows you to choose your starting and ending x,y coordinate location on the screen for each clip.
The speed of the animation is automatically determined by the overall length of the clip. Longer clip = slower speed, shorter clip = faster speed.