Great thread idea!!
First thing that comes to mind was my ODC and ODB3 stacked together. This used to be my go-to for really heavy parts or when my guitarist soloed. They are both off my board now, but I'll always remember that combo fondly. I now have the SA OFD and Blower Box in their places. Im still learning both separately and together, but they are stacking decently now. The outputs have to be controlled so its a long time to come yet. I may stop stacking dirts though since I have all I need in the five that are left on my board.
Anyway, I really dig the Duality with chorus. Speaking of fuzz, by God you should hear it with some of the presets I have my Duality going with my POG2. Heavenly I tell you. I can honestly say that the Duality is probably one of the funnest pedals to stack with most other pedals on my board. I can take it a step further. For one of our bands songs, I wrote most of the it on bass, I have the Duality, POG2, delay, trem and chorus going all at the same time and it sounds AWESOME! Thats just for the intro to the song. Then I add wah to the last note of the intro. Great fun. Most times I try not to stack too many pedals at once cause it can get crazy quickly but it sure is fun to see what you can come up with. But those are some of the ones I use quite often. I also like to add reverb to certain things in certain passages. Reverb on bass can be really cool. I also seem to write a lot of things when my delay pedal is on and I had any given effect I want to at the time like dirt, modulation or trem.