Infographic for active vs passive voice. A helpful infographic from Your Dictionary. Perfect for the classroom! I like that this doesn't make passive voice seem like the be all that end all in composition.
Making common grammar mistakes is different than using what you've learned from your urban dictionary because that can be FUN, but if you are making these you might just look plain silly. Grammar is a major bug bear for me. I HATE bad grammar
Having the prepositions of time listed and in sections is nice. But I would also have more graphic examples. I would make a worksheet where the students matched examples to the appropriate preposition of time.
Shades of Modality [infographic]: A modal verb is a type of auxiliary verb that expresses possibility, necessity or obligation. Because of their commanding tone, modals must be used carefully, and some writers attempt to avoid them entirely.