Not sure what you mean by "Greetings Card Designer". If you mean those email e-cards I'd probably suggest Gimp - you can make animations and stuff. If you mean designing a physical card you can print out, maybe Scribus? (I have never tried this but it sounds like it would do the trick) or there might be something in the Open Office programs, I'd suspect. (I don't use these either)

As for the camera, I can't help you, but for my own, I googled the model and added "linux" to the search terms and found a solution quite easily, it just involved adding a line to the fstab, and running a command. Hope some of this helps