Padlet has added a new feature called Catscan to their iPhone and iPad apps. Catscan's purpose is to let you take a picture of a set of physical sticky notes and then have those notes appear as individual notes on a Padlet wall. Once those notes are on your Padlet wall you'll be able to move them around and interact with them just like notes that you manually add to any other Padlet wall.
Catscan is a beta feature of the Padlet iOS apps so don't expect it to work perfectly right away. If you have physical stickies that are overlapping, Catscan will have trouble differentiating between them.
Applications for Education
If you lead group brainstorming sessions or gallery walks in which you have students place sticky notes on a board, Padlet's Catscan feature could provide you with a way to digitize and reuse those notes. Share the wall that the notes are added to and your students can help sort them and or add more ideas to the fall in the form of digital notes.
Watch this video for more ideas about adding notes to Padlet walls.