I was inspired by the works of PeterC and CX Gamer.
I created a 2 x 2 x 6 D Flip Flop
It may not be the smallest, but I think it still might be useful.
Overview:
Front View
Left View
Right View
Output
Construction Detail View
Left View
Right View
Output
Construction Detail View
Tiled
I also have a 1 wide (not tileable) 5 x 5 version if anyone is interested.
If anyone is interested, I can post my process from truth table, to logic diagram, to working redstone.
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