Well they can't really use it like premium members use a journal skin but they can submit their journals as a deviation through Sta.sh Writer. There's an option that allows you to choose a skin. But with the new submission feature and all, I'm not sure it will really work.
I use Snagit 10 (you can download it from here). It allows you to capture the whole scrolling area instead of having to combine all the images. It can also do a lot of other cool things too like capture videos (good for speedpainting ) and also editing/resizing screenshots. Hope this helps