Hi BC. You are partially right - there are a number of Japanese sweets made using mochi as an ingredient. Plain mochi itself is rather bland, so it is often combined with sweeter flavors (or flavors are added to it to make it sweeter).

Are you a chocolate-y kind of person? Prefer fruits or something? What kind of sweet flavors do you like in particular?

Right off the bat though, I will recommend these:

http://i.imgur.com/CzM3t.jpg

Chocolate mochi
They mix cocoa in as an ingredient for the mochi casing, fill it in with some textured chocolate in the middle, and finish with a dot of ganache at the center.

The slight chew to the mochi draws out the melty chocolate taste, suspending it for the duration of the treat. The ganache is that final nail in the coffin, at the funeral of your self-restraint.

Be right back. Just going out to buy some chocolate mochi.