These stills have all been captured with a Nexus 5 on HDR+ mode on android 4.4.2 with low lighting both outside and indoors. They are completely unedited and there is no flash on HDR+ mode. These are simply a reference point for those of you out there who are curious about the low light picture quality on this phone. Feel free to discuss your tips and tricks for better picture quality in the comments. As for my opinion, the stock camera is serviceable and while the red and yellow are a little too strong for my taste, it can easily be remedied in any photo editing program. To view in full quality just right click on the picture and choose "Open link in new tab."
More snapshots taken with my Nexus 5 under different lighting conditions (updated 1/7/14)