You can absolutely both make your own art or you can use what is available on the website or you can get lots of free patterns here.
I did a few youtube videos a while back-- they are poorly done and by no means cover all the things that are possible, but they cover some of the things you can do
There have been several notable software advances since these videos were made (notably the 2d and 3d tools) which help further pattern making even more.
I hope these help- they are by no means the end-all-be-all for the software. These vids were just me "dumping my brain" onto video a few months ago. I have learned MUCH more since these were made... the CW is so easy to learn and so complicated to master....
Lawrence