I noticed this site because of a discussion of FreePik having work they didn't own the rights to.

Shutterstock pumpkin poster and CG Vector version

Shutterstock thanksgiving card and CG vector version

Shutterstock easter bunny and CG Vector version

The site is registered to someone in Islamabad, Pakistan, so it's not clear if a DMCA takedown notice would do any good, but GoDaddy is the host. If you are the copyrightholder you can complain to GoDaddy to get the work taken down.

I see the images are being taken down as you mention them.

I guess they're working with this illustrator, too:

http://www.shutterstock.com/pic-164516195/stock-vector-christmas-background-vector.html?src=_u1BjNwgI2V9WiW4Vs_3Hw-1-84

http://www.freepik.com/free-vector/christmas-snowy-greeting_829913.htm#term=christmas&page=9&position=12

Looking at that shutterstock account, I kind of think the images are all stolen from free sites, which would be an interesting switch.