This year I made:
A plum blossom.
The bud symbolises faithfulness, and the flower innocence.
A Hime Daruma
Daruma is a kind of doll that when fallen down stands up again. These are often made from papier mache, have a weight inside, and are thought of as bringing luck.
As a Hina ornament is symbolises endurance and the 'never give up' spirit that is so important in Japan.
In olden days the Hina dolls, when not used, were stored in boxes with dried chili peppers. It served as a insect repellent (mothball).
Made for the Hina display, it is a wish that the girls of the family should not fall victim to evil 'insects' (bad luck or bad men!).
You can read much more about Hina at my page HINA, at the top of my blog.
Added later 1:
If you want to see lots of other Hina dolls, head over to Tanya's excellent report from her friend's house. Lots of pictures, don't miss it!
Added later 2:
KippySoMature mentiones in the comments below about the Hinamatsuri song. Here is a videoclip.