I still feel a bit frustrated that, for making 3D games, there is still not something as simple as 2D pixel art to make artwork. So far basically you have:

1. Poly modelling (hard and laborious)
2. Sculpting (hard, not directly viable for games)
3. Voxel art (easy, but looks very meh)
4. CSG style tools (easy but tends to look like ass)

But little progress happened in these areas. I have some ideas though of what may work! (continued)