I would prefer to stay away from Lettermark so #14, #13 and & 12 is a big nono. The only one up to now is #11 that might some potential:
1) colors are too cold, try something warmer (lime green) 2) Have the K Be smaller so it doesn't extend out of the border of the "D" and make it thicker 3) make the edges and lines slightly "lively" 4) Add antennas to the D 5) "digital krikits" should be one color, lighter grey