I've found myself enjoying these fillers somewhat not so much for the actual episode, but the closing credits at the end. Every single episode has slightly different ending credits that start off featuring one particular character (that's not always a good guy) using clips starting from Hueco Mundo (of course the one with Nell is my favorite).
337
The Developer of the Modified Souls338
Kon's Thoughts, Nozomi's Thoughts339
Critical Hour! Nozomi VS Kageroza340
Reigai Vs. Original, The Fierce Fighting for Gambled Pride!341
Invading Army Arc, Final Conclusion!342
Thank You343
3rd Year High School Student! Dressed up, and a New Chapter Begins! 344
A Dispute in School?! Ichigo and Uryuu, Fight Together!