Here's a video of it in action...

https://www.youtube.com/watch?v=-4FPl4xUSe8&feature=youtu.be#start=0:00;end=0:15;cycles=-1;autoreplay=true

Here's a group I made for my LED lights and things, if you like my LED designs, join the group and you'll be updated as I upload new ones... I plan on making a lot more logos just like this. So if you have and suggestions, please tell me and I'll make it.

http://www.thingiverse.com/groups/things-with-leds/things

This is a extruded LED Makerbot logo I printed on my dual extruder... I took a JPEG of the Makerbot logo and traced it in Solidworks... I then extruded and filleted the letters and saved them as their own STL to be used in dual extrusion... I then designed a plate around the letters, added holes for screws and save that as its own STL... Lastly, I design a shell to go around the plate and letters, the shell has aligned screw holes so it can be fastened to the plate...

I then printed the shell in regular ole black PLA on my Rep 2... And I did the dual extrusion using the same black PLA for the plate and I used Bendlay (link below) to print the letters... I used Bendlay because it is extremely translucent (91% of light passes through)...

I then hooked up an RGB LED strip, wrapped it around the inner shell and hooked it up to an IR receiver so it can be controlled with a remote...

I've also made the following logo's, designs for LED hookup...

SuperMan: http://www.thingiverse.com/thing:905146
StormTrooper: http://www.thingiverse.com/thing:905142
Punisher: http://www.thingiverse.com/thing:905140
Transformers Autobot: http://www.thingiverse.com/thing:903550
Transformers Decepticon: http://www.thingiverse.com/thing:903558
IronMan: http://www.thingiverse.com/thing:904807
SpiderMan: http://www.thingiverse.com/thing:904822
Jeep Emblem: http://www.thingiverse.com/thing:908360
Batman: http://www.thingiverse.com/thing:908353
Mortal Kombat Logo: http://www.thingiverse.com/thing:904811
Makerbot 'M' logo: http://www.thingiverse.com/thing:903428
Apple Logo: http://www.thingiverse.com/thing:903448
Android Robot: http://www.thingiverse.com/thing:903441
MakerFaire Robot: http://www.thingiverse.com/thing:900647
I <3 3DPing w/beating heart: http://www.thingiverse.com/thing:900678

Bendlay Link:
http://www.amazon.com/MatterHackers-BendLay-Filament-1-75mm-MakerBot/dp/B00K1NRCIY/ref=sr_1_1?ie=UTF8&qid=1435347958&sr=8-1&keywords=bendlay&pebp=1435347954416&perid=1WG2SRVP9TGP9WAM748W

Pretty straight forward, You're going to want to dual extrude the plate and letters together... I used PLA Black for the plate and Bendlay for the letters due to the fact Bendlay is extremely translucent (91% of light passes through)... But you could use Natural PLA or a translucent filament, but they aren't as translucent as Bendlay is...

I did not print a floor on the plate and letters print so it would allow more light to pass through... I did too much infill (10% linear) on mine... I wish I would have done about 5%...