I must say, i do enjoy Kraken Dice's new modern take on the D4: It's still the triangle type deal, but the pointy edges are flat and the highest Number is placed the flat parts as well as the usual d4 number placement.
I have two "custom dice" that I like and would like to incorporate into games I design.
1. a "d5", but with 0 - 5, so you really have six-sides. Currently we just use standard d6s, treating 6's as 0's.
2. a "d10", but using the d12 so the two additional sides are 0 and "+". Your number results are this 0 - 10, and explode on the "+".