You can use these avatars freely on messageboards, but if you use them on on website please link back to my site in your credits. Use on your website means in your updates or something similiar, I don't want you redistributing these! Just link back to my site for your visitors to browse on their own.
Also, do not directly link to these. I have direct linking blocked so you'll get a broken image. You'll have to upload them to an image host, they cannot be linked from here! Thanks!