Ok most of you are on the right track. From these photographs, i can tell you the most likely variations(difficult due to interbreeding of platies for so many years).
The First is a Classic Mickey Mouse Platy golden, Female.
Second appears to be a X Variatus species(Although may contain X Malactus Genes due to the interbreeding of platies), looks most likely a male and is a Green colouration. Note that it is difficult to see if it is a true gonodopium or a anal fin held close to the body. Profile suggests male. Green Variatus Male (Mexican heritage from the thin body).
Third is again a Platy, also with variegated ( Mickey Mouse) patterning, however this one i am intensely jealous over. Notice the extended dorsal fin as well as generally longer fins: This is the Hifin variety in particular the Red Dorsalled, and the colouration appears to be golden. Hence this is a Golden variagated red dorsaled hifin platy. What a mouthful. From this camera angle it is a Male. This is a sensitive and very inbred species, the equivalent of the fancy guppy.
There yah go, you know what youve got. Look after that Hifin