There’s a ton of Firefly fan-made lego models out there; here’s some of the best I’ve been able to find…if only the people behind Star Wars Lego and Harry Potter Lego would be inspired enough by these to make us a Firefly Lego game, huh?
Serenity herself

http://www.reasonablyclever.com/lego/firefly/lightup.htm
epic light-up Serenity from reasonablyclever.com

http://www.reasonablyclever.com/lego/serenity/download.html
on a smaller scale - another reasonablyclever.com creation
‘Verse Miscellanea

http://www.brothers-brick.com/2008/04/06/serenity-mule-legod-by-lord-t/
I swallowed a bug. From www.brothers-brick.com.

http://www.flickr.com/photos/spotzle/4485818502/sizes/m/in/photostream/
Blue Sun mosaic - keep out of reach of crazies, they might smashy. From flickr.com, by spring_mcmanus
Thrilling Heroics
Firefly characters!

http://www.fireflyfans.net/sunroomitem.asp?i=4693
Serenity crew encounter Darth Vader! From fireflyfans.net

http://www.motifake.com/index.php?start=1228
Had to be one out there somewhere XD ...from motifake.com

http://www.flickr.com/photos/reasonablyclever/4678753894/sizes/m/in/photostream/
Be afriad...from flickr.com, by Reasonably Clever Chris.

http://www.flickr.com/photos/vidgamer838/2704016019/sizes/m/in/photostream/
No grenades - from flickr.com, by Vid
And finally, the chilling Two By Two…

http://www.flickr.com/photos/dunechaser/103294299/sizes/m/in/photostream/
...Hands of Blue! :O *flail* from flickr.com, by Dunechaser
Lego Forever! I still remember how I used to love them as a kid.
Its show time.. they all seem geared up for a war.. haha!