Can you try some more ideas with the three pixels #122?
You can try the following:
1. Tilt in 3D
2. Make the pixels 'diamonds' instead of 'squares' (rotate each one 45 degrees). I don't want to copy the ciplex logo however.
3. perhaps try rounding 2 of the corners of one or more 'pixels' to give abstract appearance of a 'D'
I like how rounding 2-3 of the corners of a square will still give the appearance of a 'D'.
4. any other ideas you have
Here is another design I came across that is kind of cool
http://creattica.com/business-cards/base-10-business-card/19545