A cow in a barn costume. Great for Halloween and so cute and awesome for colder weather!
Back to the Future Delorean Halloween Stroller Costume by Lunchbox Dad and other adorable halloween stroller costumers!
Old-school aviator costume - Turn the wagon (or stroller?) into an airplane.
Octobaby - Halloween Costume Contest via Costume Works
Coolest Stroller Halloween Costumes for Infants - Homemade Costume Contest, I love the star wars one!
This cute little lion is perfect all on its own but when you add in a circus wagon and a fire loop wielding ringmaster (coming up next!), it takes this getup to a whole new level of awesome.
Rookie Moms – Halloween costume ideas for babies in carseats, strollers, or other things with wheels
Card Dealer - Homemade costumes for babies
Frog Prince / Kissing Booth Stroller Costume - Tip Junkie too freakin cute
Batmobile made out of stroller