I'm surprised we haven't had any videos like this in the past. Alecomac has taken the plunge into all of the older generations of pony to show off the progenitors for the mane 6, from Applejack's old selves to Pinkie Pie. Remember Rainbow Dash Always Dresses in Style? Take that but expanded to everyone and including more generations.
Check it out below! It will make you appreciate how lucky we got with Lauren Faust bringing on the modern mane 6.