What I like best is that it's extremely intuitive to use. You can choose from the high quality graphics and photos included or you can upload your own.
When you want to easily layer a photo over another one, without messing around with Photoshop, Canva is the way to go. I've also used it to create infographics and handouts, as well as simple, but elegant graphics for my resources guides.
Another aspect I appreciate about Canva is that you can create custom sizes for your canvas art. This is important when you need to change your header for a social media site that changes their header sizes pretty regularly (I'm looking at you Google+).
Finally, something else that Canva offers is a feature called Design school, so for those of us who are not naturally gifted designers, perhaps Canva will help us craft more pleasing designs.
Anyway, I've always used Canva here and there for small projects, but during the last week, I've used it so much to help with my new logo that I felt compelled to share it with you.