I haven’t used indigo myself (yet) although googling has shown threads suggesting it is possible for us Linux users.
Discussion about the two here: http://www.indigorenderer.com/joomla/forum/viewtopic.php?t=2796
…probably that’s a good discussion group to post indigo specific questions.
Indigo for 64 bit Linux download: http://tinyurl.com/3xhzns
Indigo for 32 bit Linux download: http://www.tinyurl.com/33zhb5
Downloadable how-to for successful installation: http://www.indigorenderer.com/joomla/forum/viewtopic.php?t=2921
Wine install (allows GUI): http://www.indigorenderer.com/joomla/forum/viewtopic.php?t=3032
Apparently something called Blendigo also helps with the above, although not having tried it myself yet, I’m not sure on which versions (wine versus native Linux) there are or the differences. http://www.indigorenderer.com/joomla/forum/viewtopic.php?t=2862
P.S: I think the less than orange colouring in your render is due to you having the default blue world background, which your objects are reflecting (you are probably using raytracing). Change the world colour to white and see how she renders.
Later on, with a little more blender experience, return to your logo project and look at rounding off / beveling the flat right angled edges. Small technique that makes all the difference to a good render if you’re thinking about using serious renderers. I posted up something on this onto someone’s thread a small while back: http://blenderartists.org/forum/showthread.php?t=108661&page=2
…have you looked at yafray?