Here's a simple style that looks like you put a lot of time into it but really it's pretty fast.
Start by parting all the hair right down the middle. Grab two small sections of hair, right up front, on both sides of the part. Pull each section into it's own elastic.
Move to the right half of the part and divide out another section of hair right below the first. Divide both of your small ponytails in half and add the right-half of each ponytail in with that newly divided section of hair and secure it with an elastic.
Move over to the left side, part out a new section below the first and combine the remaining halves of the two ponytails in with that and secure with an elastic.
Now you have two small ponytails once again. Just repeat the process of parting out new sections under the previous and dividing the two ponytails in half. Make sure you always take the right halves of the ponytails to the right section and the left ones to the left section.
Continue doing this until all of the hair has been gathered into elastics and you have two ponytails at the bottom of the head.
Tie some ribbons over your final elastics and you're all finished!