I chose to put a DOI symbol (thanks to the Academicons package) at the end of each bib entry. I think it looks rad.
% Entry lacks DOI
% Entry lacks URL and DOI
% Entry has URL but lacks DOI
% Show URL hyperlink as icon (concsiously not using same icon as our "external hyperlinks")
% Entry has DOI \aiDoi
% lower the DOI symbol a little to align better with baseline
% suppress output of DOI field (hide both DOI label and string)
Here's an example of how the typeset bibliography entries look like (please excuse the poor resolution, the screenshotter suddenly decided to drop the quality):
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