OK, Trai and SoG have volunteered to make tech icons, so I'll take stock of what I need in this post.
There's no law saying all icons have to be scratch-made; if there's something already-made you think I could use, feel free to suggest it.
Trade: Some typical Mesoamerican trade goods would be good - feathers, cacao beads, precious stones, sort of thing.
Stoneworking: I'll use the C3C "StoneCarving" one.
Corvé: A worker gang.
Script: A glyph
The Teotihuacan Connection: A
talud-tablero building.
Architecture: A temple, I suppose.
Calendar: Sun and moon, perhaps?
Ballgame: I'll use the C3C one.
Divine Monarchy: Carving of ruler with deity above
Blood Cult: I'll use the C3C one.
Stela Cult: A stela, not identical to the building icon.
Royal Inscriptions: Glyphs.
Waterworks: A
cenote.
Militarism: A warrior?
Warrior Cult: I need ideas for this one.
Dynastic History: Yax Pasaj and Yax K'uk' Mo' from Altar Q.
Fortifications: Wall or tower with a look-out on.
Navigation: Ships.
Pyramids: Pyramids.
Collective Rule: A Maya noble and a Toltec standing next to one another? (Thinking Chichén Itzá here.)
Total War: Burning village, or pillagers.
Prophecy: Shaman, or vision serpent.