I don't know why I didn't think of it sooner, but I finally thought to google these pumpkin carriage ideas and look what I found! And I'm sure we could make it not so dark and creepy, but it's really cool!
I love the metal embellishments on the top of the large pumpkin, around the window/door areas and on the wheels! I think that looks so adorable! And If I use a white or orange pumpkin for the large one, it will look more wedding-like. Also add in some wire with curls in it, that will look so cute!
Here's another one I found online, though not as cute.
Here's another cute idea:
And here's another one:I think my sisters, friends, and family are going to be working really hard for my wedding!