Swamp...landscape or waterscape? 0.o; I DON'T KNOW!!!
Do not claim them as your own/submit them as your own photography. They're not.
Use them to make other stock. That's redistribution; don't do it.
Use them for your manipulations for commercial, non-commercial, offsite and on. Change the image and make it your own.
Credit me where available. I like to see what you make.