We've just made another minor Snap! release - v5.1.0 - that features, among other things, a new block in the "pen" category called "paste on _":
"Paste" is similar to the "stamp" block, but instead of leaving a print on the stage's pen trails layer the new "paste" block leaves a print on another sprite. It does so by creating a copy of the sprite's costume with a print of the source sprite on it. To clear the pastings you can let the sprite switch back to the original costume (or to another one).
This opens up a variety of fun ideas to try, and I've been having a blast playing with it already. It's especially interesting when both sprites move and turn independently:
It also opens up new twists to turtle geometry. For example, instead of moving and turning a pen sprite you can now move the sprite and turn the background, like this:
But you can also use the "paste" block for creating your own jigsaw puzzles and for overlaying versions of pictures and letting the user "slide" them:
We can't wait to see what you'll build with this new "paste" block!