People make Romulan Ale cocktails and beers and I found a thread on Northern Brewer's forum talking about it. Food coloring seems to be the way to go.
http://forum.northernbrewer.com/viewtopic.php?f=1&t=76133
(And RIP, Mr. Nimoy.)
This is what I found about the Romulan Ale pictured:
The smell is corn, grainy, weird, wheat, floral, and yuck. The color is blue and the look is clear. The taste is weak, corn, and water. Bad stuff.