I started with a single plant form using this image as my reference:

Then I sketched the basic form:

Then used the brushes in the class to add some color:

 

Here are a few more I made using the processes from Projects 2 and 3 in the class:

 

These look great on print on demand projects!  I used Society 6 to make these mockups ( I show how to do this in my Society6 class: https://lizkohlerbrown.com/society6-for-ipad-artists-and-designers/