To me, Bionicles do give me a nostalgic feeling, especially when I look back at the 2001 era Bionicles that my brother and I would play with, though all of the Bionicle eras are near and dear to me.
When the time comes, I will use all of my Bionicle pieces to construct a huge, shapeless mass of parts and have it up for display somewhere in the house.
I'm just polishing up my MOC skills for now so that they are both highly balanced and posable. However, I may make a stop motion video using my MOCs in the distant future.