I have finished reading the Bonkle books. Obviously they're not aimed for people my age, but I still enjoyed them nonetheless and found it pretty nostalgic. I'd have to say the Metru Nui arc was my favorite, and the Toa Metru are probably my favorite Toa team. And Time Trap is still the best Bionicle novel.

Now I have to try and find something to fill the void finishing has left me with...