Giving our recent discussions in the Suggestions and Requests thread, I’ll necromance this thread to propose some possible Wonders.
Steb’s overview shows a lack of Wonders for Africa in general (except Egypt) and that currently only two civs don’t have a “personal” wonder: Harappa and Argentina. So, I decided to give a shot with some suggestions:
Floralis Genérica
Base Yield: +4

Specialist Slots: Artist (3)
Great People Points: Great Artist (+2)
Special Effect: Nature Reserve, Marine Reserve and Solar Collector +2

; + 2 Relations with civs with Public Welfare
or +1 Happiness to Recycling Center, Solar Plant and Park.
Unlocked by: Ecology
Special Requirements: Public Welfare civic
Production: 1000

, double production with Iron
or Aluminum
Obsolete:
Great Adobe Mosque
Base Yield: +6

Specialist Slots: Priest (1)
Great People Points: Great Prophet (+2)
Special Effect: Flodplain and Marsh tiles produces +1

and +1

Unlocked by: Theology
Special Requirements: Islam, Marsh tile within city radius
Production: 360

, double production with Ivory?
Obsolete: Urban Planning
Fasil Ghebbi
Base Yield: +6

Specialist Slots: Statesman (1); Engineer (1)
Great People Points: Great Statesman (+2)
Special Effect: +25% defense in core cities; can only collapse to the core
or Military Units receive 10%

inside cultural borders
Unlocked by: Statecraft
Special Requirements: Orthodoxy, Incense
Production: 800

, double production with Stone
Obsolete: Assembly Line
Hassan Tower
Base Yield: +4

Specialist Slots: Priest (1), Merchant (1)
Great People Points: Great Merchant (+2)
Special Effect: New Naval Units receive +2 exp; 25% chance of capturing enemy naval units
Unlocked by: Patronage or Compass
Special Requirements: Islam
Production: 560

Obsolete: Nationalism
Mosque of Uqba
Base Yield: +4

Specialist Slots: Priest (1), Scientist (1)
Great People Points: Great Prophet (+2)
Special Effect: Reduces maintenence of nearby cities; faster culture conversion; Priests produce +1
or double production to Monasteries
Unlocked by: Architecture
Special Requirements: Islam, City in a different continent than the capital
Production: 260 hammers, double production with Stone
Obsolete: Education
Meenakshi Temple
Base Yield: +6

Specialist Slots: Priest (2); Merchant (1)
Great People Points: Great Prophet (+2)
Special Effect: Priests produce +1

; double

value for Trade Routes in the city
Unlocked by: Patronage
Special Requirements: Hinduism
Production: 600

Obsolete:
Stave Church
Base Yield: +2

Specialist Slots: Priest (1)
Great People Points: Great Prophet (+2)
Special Effect: Double

from pillaging
Unlocked by: Compass or Paper
Special Requirements: Catholicism, Whale
Production: 260

Obsolete: Urban Planning
Great Bath
Base Yield: +4

; +2

Specialist Slots:
Great People Points: Great Engineer (+2)
Special Effect: Double production for Health buildings
Unlocked by: Masonry
Special Requirements: Paganism, No major religion present
Production: 120

Obsolete: Medicine
Ulugh Beg Observatory
Base Yield: +2

; +30%

Specialist Slots: Scientist (2)
Great People Points: Great Scientist (+2)
Special Effect:
Unlocked by: Cartography
Special Requirements: Islam
Production: 480

Obsolete: Scientific Method
AFAIK, we have art assets for all proposed wonders except Fasil Ghebbi.