On our first year aniiversary I gave my current wife a journal. But it wasn't just any journal - I had it made at Kinkos. I think the total cost was somewhere in the $30 range. I picked out the paper design and bought like 250 sheets of it and picked a cover for it and wrote a little something on the first page of the journal. I wrote down that in case we stay together for a lifetime we can look back at our experiences together and hopefully learn from them. She still has it but she's running out of pages.
Another idea is to temporarily steal something of hers and then getting it inscribed and then giving it back to her with the inscription. That's always a winner. In fact, I'd even go as far as getting her really dissapointed about her item "mysteriously disapearing". It adds to the drama when it resurfaces again. Trust me on this one!
Its better to be on the ground wishing you were in the air than be in the air wishing you were on the ground. Fly safe!