It's frustrating when your students don't take their instrument out of its case between their weekly lessons.
Here is something to try; it might make it more fun for your students to at least get their instruments out of the case.
The idea is that the students pull out an iPhone or iPad and run the Draw With Music app. They then play some simple exercises, set by you, and see a picture being drawn on the app in response to what they are playing.
Draw With Music is an app that listens to you play notes and draws a line in a different direction for each note.
Download free PDFs of music exercises for your students.
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The app is not yet released but please join the mailing list to be notified when it is released.