PiktochartI used Piktochart to create the graphics above, utilizing the free version. There are several other choices to choose from. Here is a nice comparison.
I had access to 7 themes, and was able to customize one with colors to fit. I found it to be fairly easy to use, either with the old or new editing tools. There were several choices for pre-made graphics, and it allowed you to insert your own data to create a chart or graph or import your own. I think Piktochart could be a great tool for students in virtually any subject to communicate ideas and information. I encourage you to give it a try!