There is an interesting mochi during this time of year called Hanabira mochi.
Hanabira literally means flower petal.
White mochi (rice cake) is rolled out thin and a pink colored mochi is added to it so that you can see the pink through the white.
Inside of the pink mochi, some sweetened miso and a candied gobo (burdock root).
It is said that the 11th head of the Urasenke (Japanese tea ceremony school), Gengensai, created this sweet based on the "hishi-hanabira", a sweet that the Imperial court would eat during the New Year.
I purchased this one at Chikujian...delicious with some green tea.