I liked the one with a card sliding into a weirdly shaped blue circle. I'd say take that, smooth things out a bit, and make the visual look more definitively like something the card is being slotted into by hiding the right side of the card behind the blue thing. Kind of random, but really, who cares? What matters is if it looks cool.
Another thought is that the card could be a silvery color, with the blue circle thing having green continents with blue oceans (decorated like the Earth), rather than making the card green. Kind of symbolizing connecting your computing to mother Earth, or some such thing.
For monochrome, you could just convert all the edges between colors into outlines.