The bookmarks sound unique in their own rights. Are you both bibliophiles? Maybe some kind of book-centric centerpiece like a small pile of books (each table with a specific author / series), with bookmarks sticking out topped with a candle?
My sister's an artist and BIL's an architect so my sister (much to her regret for doing all this by hand herself) bought egg shaped wood pieces from JoAnn Fabrics, cut out a "thumb" area to make paint pallets, put drops of paint around the edges, then took litte pies of paper and had them rolled up to look like blueprints (one edge had their names & wedding date printed on them) as wedding favours. They're great and I still have mine, but man they were a pain in the butt to make for 200+ guests! She also did 5 chocolate drops in netting for each guest.
My brother & SIL had mini picture frames with their names & wedding date written on them as their favours. They placed them on a table when you walked into the reception and they had everyone's name in them and their table number. Then, on the tables instead of decorating them they had scattered photos of each of them over the years - from infacy to present and then covered them with glass in the centre, where they had a candle sitting in the middle.
Some friends of ours (DH & I met working at an amusement park) were real ACE enthusiasts and so they named each of their tables after their favourite roller coasters and had photos of the coasters on the tables, and then had personalised crossword puzzles and word searches for guests to play with.
For our wedding we were a Tatty Bear theme: we ordered Tatty Bear Invitations, Tatty Bear Cake topper and then we ordered Special Tatty Bear fridge magnets with our names and wedding date on them. Consequently my cousin became obsessed with them.
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