Create a project that controls the appearance of a sprite via the keyboard. As just one example, you could create a project where a sprite gets a little bigger when you press the B key, gets a little smaller when you press the S key, and changes its costume when you press the M key. (Remember, if you get stuck, find inspiration and support in the Teaching with Scratch Facebook group, our list of Getting Unstuck strategies, or on Twitter at #CreativeComputing.)
Tag your project with #GettingUnstuck! Mark it as a draft if you add it to the studio but are continuing to work on it - we'd love to help!