Good of you to contact the other artists. Something to note. Just because you obtained icons from a free site doesn't mean they are free to use as you wish. Most of those sites harvest icon sets from other sources. The link you provided on your site to the Token icon pack from Iconspedia has the following license info:
CC Attribution-Noncommercial-No Derivative Works 3.0 License.
http://www.iconspedia.com/pack/token-light-228-/
So maybe you should double check everything.
Don't get me wrong. I'm not trying to discourage what you're doing. I appreciate your work. In fact, I'm using one of your sliders. Just giving it to you straight with no sugar coat like you asked.