Icons from scratch/image manipulation.
TOP: Hatchery – the Hatchery villain’s face is used for both the point of interest icon on the map, and a variant look was used on the Seasonal Trial screen.
Tent – less is more!
BOTTOM: These are mostly from images. Stock image of photosynthesis manipulated into blob… add some bumps, some specular highlights, and depth… and we have verdant essence.