Can I use these however I like?
Generally, yes, as long as you’re using them for good, and not evil. If you’d like to use them, all I ask is that you give me credit and not claim the work as your own (as I’ve done in some of my handouts). If you repurpose it in your own handouts in any way, please list me as a source or contributor, much the same as we’d do in an infographic or news story.