I'm nearly nine months from D-Day and celebrated our first anniversary of our "new life" earlier this week. Even though reconciliation is going well, I had a lot of apprehension going into the day.
My advice is tell your spouse directly how you would like to recognize the day (or not). In my case, because of our kids' schedules we knew we couldn't go out or celebrate or do anything on the actual day. So I told my husband that (a) it was really important to me that we find some date soon to celebrate, and (b) that it was important to me that he acknowledge the day in some way even though we were postponing our night out.
So we picked a date to go out, and he's planning something. And on the actual day, he gave me a lovely card with a personal and heartfelt note (and I did the same for him).
I can relate to your point about the cards - when I went to find one, I spent half an hour in the Walgreen's, crying. My suggestion is to find a simple card - or even a blank one (good advice I got from someone on SI) - and just share how you feel with him. It's awkward and raw, but your speaking to him from the heart will mean a lot. And that approach - even if comfortable - will give you the best shot at being true to yourself and not feeling like you're faking something or trying to manufacture emotions that you're not yet ready to have.
Good luck tomorrow and I'll be thinking of you.