I don't remember these episodes well enough to rate them.
O Little Town..., Syfy
Eureka Wiki; IMDb; TV.com
This is a special holiday episode that aired in the middle of season 4, in December 2010. I guess it's not part of the normal continuity of the series, so it's sort of fair to call it a "special." Anyway, I had completely forgotten about it until I started this page to mention the 2011 special, below. So I can't say anything about it, but if I ever see it again, I'll write up a proper review.
Do You See What I See, Syfy
Eureka Wiki; IMDb; Syfy; TV.com
This is a special holiday episode that aired in December 2011, between seasons 4 and 5 (though it's technically included in season 4). It's outside the normal continuity of the series, so it's sort of fair to call it a "special." Unfortunately, I didn't decide to put a page for it in my specials section until a couple years after the episode aired, and now I don't remember it well enough to rate it or say much of anything about it. Maybe I'll write a proper review if I ever get a chance to see it again. For now, all I can tell you is that, as so often happens in Eureka, experiments went haywire, causing the whole town and its inhabitants to become animated. Throughout the episode, there were several different styles of animation, which I enjoyed. Oh yes, it was definitely a fun episode... and only slightly crazier than typical Eureka episodes.