I just added four male lyre tail guppies to my twenty gallon today. At least, I'm pretty sure they're male, you sex them the same way you do platies, right? And the petstore claimed they were all male, but thats what they said about my female platies.
They look really good in the tank - I don't have a camera but I'm going to try to see if I can get a friend to take a picture. They are mostly whitish silver with orange areas. They really pull the tank together for a more uniform look, my platies are red orange and my dwarf gourami is silvery blue with tiny orange stripes - It looked a little awkward before.
In other news... I got a black moor
goldfish today too, but thats another tank.