A second honeymoon. A vow renewal ceremony. A mini scrapbook/ album of all your favorite photos of the past 10 years (or his favorites)... maybe that's just putting a few of the layouts you've already made into a special book or something. A repeat of your first date, or first anniversary of something.... then/now type thing. A watch, symbolic of all the time in the relationship (maybe personalized with an inscription or something on the back). New wedding rings/set? A wall progression/timeline display in your hallway, documenting the past 10 years.
Maybe plan a special year of things for your whole tenth year... like a small thing each month on the day of your anniversary, culminating with a special 10th yr ornament in December for your tree, if that's what/how you celebrate.
Tickets to something you've never done before, symbolic of your continued passion for new adventures with each other. Maybe a tenth anniversary edition of a favorite movie or book he likes...
I'll think some more...