I changed the stock rules for some of my photos.
Some of them are free to use however you like inside and outside of DA as long as you do not use them to encourage offensive or racist behavior (in short be decent and creative with them). For photos where I changed the rules see their description.
Also I would love to see what you have done with them so if you want you can post a link and I will go and visit but this is not mandatory.
Stay safe and be creative.