The Ending According to Me

After all the ponies had finished telling their cutie mark stories, the Fun Cutie Katchers trotted home happily.  They talked about how awesome it was that all the older ponies' cutie marks were related somehow.  Even Big Macintosh told the story about how he single hoofedly bucked every tree in Equestria, and then ate every single one.

When they reached Ponyville central, they stopped and thought for a while.

Then they all made their own decisions.

"I'm going to run away from home," said Applebloom.

"I'm going to sit around until my horn lights up," said Sweetie Belle.

"I'm going to do dangerous tricks until I do something worthy of a cutie mark," said the chicken.

And so they did.