Not altered art, but a template for a kinetic card. Print out the template and stick it to the back of the the pictures you want to "dissolve". Fold and stick the pull tab on the moving picture. Thread the slats of the stationary picture through the moving picture and arrange until you can see all the still picture and none of the moving picture. Stick the still picture to a backing card be careful to keep the glue or tape away from the workings - put it around the edges!) When you pull the tab, the moving picture slides out over the stationary picture, "dissolving" into it. Put a frame over it all to make it look pretty!
Update - I've uploaded a YouTube Tutorial - find it here
If you use Silhouette Studio, you can download cutting files from here