In an attempt to have my students apply their learning while creating and collaborating, we sorted shapes on our tablets. After sorting these shapes into two categories, students wrote "rule" above the side with their "mystery" rule. This final product was posted to their blog. After posting to the blog, students were able to leave comments with their guesses about the attribute rule being represented by the posted image. This was helping us work towards CCSS 1.G.A "Reason with shapes and their attributes."
Below is a video that highlights how this activity was done in my class as well as how it can be done on both LearnPads and iPads.