Sarah,
The best advice I can give you is be prepared for all kinds of celebrations. Being surprised, planning, and one-sided. yes, one sided.
MY DH Doesn't celebrate our marriage. Some might call it sad, others sick, what he does and doesn't do, but he is my husband and we are married. I'm not about to dump him because he didn't learn how to celebrate - and he doesn't take kindly to someone telling him what to do.
Dinner, dancing, movies (especially if you are pre-children this is a great thing!), intimate weekends, volunteering, there are so many things you can do to celebrate your day that you became one.
If you find yourself only coming together to celebrate that one day, you might try switching things up on him - celebrating a half anniversary. Or just an 'ordinary' day can be turned into a reminder you are blessed to be together.
A card doesn't do it - unless you're making it yourself - on its own. Money isn't the answer either, it's what you invest of your own thankfulness into your celebration.
Celebrate - even if years down the road DH becomes another person altogether. We're married. You're married. It's a life thing, not a boyfriend girlfriend thing.
Just celebrate. Living, loving, laughing, celebrate. Don't worry about doing it right or wrong. Invention helps, creativity is good too, but neither is necessary - just show your love and thankfulness, and hug a lot!
Good luck,
M.