I really love the idea of a VerbFactor.  I definitely like the idea of a charcoal gray color for the VerbFactor.  Here are 10 ideas for a good selection of reverbs:

1. Plate
2. Spring
3. Hall
4. Room
5. Chamber
6. Modulation [choice of Vibrato, Chorus, Flanger, or Phaser for the tail]
7. Reverse
8. Gated
9. Studio [2016, PCM 70 Hall, H8000]
10. Black Hole [Put some insane reverb effects here]

I like the ModFactor approach where each reverb mode can have different types…this way you can have lots of different reverbs available.

Jonathan