It turns out that he has been tracing over someone's art for the icons. The actual artist is Mitchell, whom provided these overlays as well as a link to their original submission. (They don't use LJ, so here I am.)
I know a lot of people have bought those $2 icons from Gilligan, and I even advertised him to my friends here and on FA-- not at all knowing that people were paying for work that had been traced from another artist. So as a customer, I am really upset about this. I was trying to be nice to another artist, only for find out I got burned, and caused friends to spend money on traced art. :/
What's worse, is that he asks for payments to be sent as a "gift". I didn't think anything of it at the time-- of course I'll spend the few extra cents to send over $2, lol. Except now, knowing that it's traced, I can't ask PayPal for a refund. Argh!
I quickly searched through the teenycom community, and his most recent post is here:
--also advertising the icons.
edit: He's removed them since I originally sent in this post.
TL;DR: Gilligan traces and profits off of it. Do not buy his face-stuffing icons. Also I suggest checking his sales in communities to ensure nothing else of yours is being traced for profit. :/
Edit: Adding more screenshots--
From my journal entry here.
Both from here.