Do you like preserving a memory of the wedding?????
The wishing tree can be a excellent possibility :).
The guest write felicitations on the papers and hang on the boughs.
Can you make this with a simple method for free. It's enough to collect some boughs and take these to a nice vase. What's more, you can do a beautiful ornament which is sign your wedding.
I show some outstanding solution for the wishing tree
And here is the other possibility to collect wishes: