There are four simple rules:
#1: Credit me
include my name and/or visible clickable link to my stock account or stock image
#2: Let me know if you've used my stock
send me a note or leave a comment to my main page or stock picture
#3: Don't just slightly edit my pictures and then claim them as your own art. BE CREATIVE.
#4: You're not allowed to redistribute my stock images in any way.
After you have provided proper credits and notified me of stock usage, you're allowed to:
sell deviantART prints;
use pictures containing my stock images in your web layouts, banners, etc;
use pictures containing my stock images in projects involving books, CDs, etc, but PLEASE let me know beforehand.
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UPDATED RULES AS OF 25.12.2011!~
I am not active on deviantART anymore, so I've been thinking how to handle my stock account. I know a lot of people still like and use the images I provide, so I didn't want to delete them, but I also have some concerns about the way people use my images. My new, edited rules can actually be seen above, but I thought I'd still stress a few things that have changed:
You can no longer sell prints of my images outside of deviantART. No exceptions.
Whenever you use my images, you have to give credit, be it in or outside of deviantART. No exceptions.
You absolutely CANNOT use my pictures to create new stock images. I thought that that much was clear, but it appears that I do have to repeat it.
But still, have fun and enjoy~