This is a great list, Tonya! As a teacher in grades 9-12, I love hearing about the different and similar ways in which K-6 teachers implement Canvas!
ePortfolios encourage students to save their best work and to see growth! This would be a great tool to use during parent-teacher-student conferences.
The Canvas Parent app makes it possible for family members to get a peek into your classroom on a daily basis. They can see assignment information and details, and that can always kick-start those "what did you do at school today?" conversations.
Depending on the grade level, Mastery Paths can simplify the individualized instruction/differentiation process. Pair this with the Mastery Gradebook, and teachers can encourage student growth or standards-based grading in conjunction with traditional grading.
I appreciate how easy it is for teachers to customize their Canvas courses. No two courses are alike! I think that once teachers start playing around with course design, they'll find that they create just about anything. Courses can be based on buttons (visuals) or linearly in modules. Either way, I think it's awesome that teachers can house all relevant information, links, LTIs in one place. It reduces distractions and encourages students to get to the learning faster.
I'll keep thinking too! I hope other K-12'ers find this thread and chime-in! 
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