I think with the greenery and all those would be pretty. You could do those as sugardipped or something-I am sure you will have lots of ideas when people see the post! Good luck!
I had this idea for a wedding cake that will look like fall and taste delicious. How about a pumpkin cake with crusting cream cheese frosting swirls, and the outer round covered in sugared pecans, accentuated with a few autumn gum paste leaves set on top of each cake, on floating tiers or even stacked? It will look more like dessert, but I think people would enjoy looking at it and eating it. Just a thought. I am going to try the idea for my dad's birthday (but not in wedding cake form, of course!)
kajsa, how creative! I've never even thought about using rose hips on a cake but I think they would be beautiful. I saw some at the park about as big as a cherry tomato, yowzers. Let us know if you go with the rose hips/blackberries idea I'd love to see the pictures.
The hips look like they should be quite easy. Blackberries are very easy to make but a bit fiddly. Make the small globes of flower paste first allow to dry then put into a clear plastic bag. The make small cones on wires. Allow them to dry dip them in egg white or sugar glue then dip into the bag of globes. allow to dry