All stock & backgrounds unless otherwise stated can be used for any purpose except sell them as they are, you can NOT use them as a stand alone image, anything you make from them you can do what you like with them.
A link to what you have used them for so i can see your work, both on and off DA.
donations helpful and lets me get stuff for the backgrounds and keeps them as FREE for anyone to use.. Donations appreciated very much in advance. Thank You.