Let me try and think of the other things I put in there...

- A little clock (I bought a cheap plastic travel clock from the Reject Shop) so he always had time for me
- A soft toy (I chose a teddy) to hug when I am not around
- An elastic band to help us to stretch beyond our limits
- A small pack of seeds so we can grow together
- A piece from a jigsaw puzzle because without him I was missing a piece
- A star so all the stars you are going to reach for together aren't that far away

You see how sweet/corny/cheesy you can be?! I think from memory that's all I put in. I can look tonight (DH still has it close by) if you like?

It doesn't have to be pricey - these things are more about the thought/gesture.

I used some of the scrap paper from our invites and wrote little tags explaining what each item was, attached a tag to each item, then put them in a gift bag. I did the little tags because I gave the bag to my MIL and asked her to give it to DH on the morning of our wedding and I wouldn't have been there to explain.

Your box idea with the champers and the little car sounds great!

Good luck - have fun!