If you're willing to play around for a bit to learn how it works (parts of it are not very intuitive at first), I think it's totally worth it
. Yes, you can import images of anything you'd like to make a pattern of, although sometimes it's hard to make it recolour. If you'd like to see what the tool can produce, there's all sorts of patterns in our
Swap Shop made with CAP. You can also see Twinmum's guide on the tool
here, and there's also an in-program tutorial if you decide to download it.