If you list some of your ideas I'd be down to make them if I think they make sense and are fun. Unfortunately, I don't think paid work is possible unless you provide artwork that you have the rights to.
ChrisWJN Below is one of the ideas i had in mind.
Civ Name: Ethiopian Empire
Leader: Haile Selassie
Start Bias: Floodplains & Desert
Unique Bonuses and Abilities
The Lion Of Africa: Founded cities start with ancient walls. Units receive +5 Combat Strength and +1 movement in their own territory. Able to build Farms on flat Desert titles unlocked with Feudalism Civic and provides base yields of +1 Food, +1 Production, and +0.5 Housing also receives +1 Food for every adjacent Farm when 3 Farms are adjacent to each other and +1 Food for every adjacent Farm improvement once you research "Replaceable Parts". While All Flood Plains titles provide +1 Food and +1 Production in addition to their usual yields.
The Last Monarch: All cities on the same Continent as the Capital (i.e Palace building) receive +2 loyalty per turn. Double all yields from the Palace building in the City Center (i.e. +2 Production, +1 Culture, +2 Science, +5 gold, +1 Housing, and +1 Amenity from Entertainment to city center) in addition to base yields. Also adds +2 Faith to the Palace building.
Unique Units and Buildings
Mehal Sefari Cavalry: Unique heavy cavalry unit unlocks at Rifling Technology and gains +10 Combat Strength when fighting on Hills, Forrest, and Jungle Tiles. +5 Combat Strength when fighting on Neutral or Foreign Territory. Can directly attack support units and gains +50% combat experience.
Rock-Hewn Church: The Rock-Hewn Church is a unique district of the Ethiopian civilization. It replaces the Holy Site.
Effects:
Lower Production cost (27 vs. 54)
+2 Great Prophet points per turn.
+0.5 Great Engineer point per turn (Not affected by the Oracle).
+2 Faith, +1 Culture, and +1 Science if adjacent to city center.
+2 Faith, +1 Culture, and +1 Science for each adjacent Natural Wonder tile.
+1 Faith, +1 Culture, and +1 Science for each adjacent Geothermal Fissure tile
+1 Faith, +0.5 Culture, and +0.5 Science for each adjacent Mountain tile.
+1 Faith, +0.5 Culture, and +0.5 Science for each adjacent district.
+1 Faith +0.5 Culture for each adjacent Woods tile.
+1 Faith +0.5 Science for each adjacent Jungle tile.
*Triggers a culture bomb affect once completed claiming surrounding tiles*
A religion can be founded in a Rock-Hewn Church.
Religious units can be purchased in the city with a Rock-Hewn Church, spawning in the Rock-Hewn Church or if that's unavailable in the City Center (stacking limits permitting).
Religious units heal in a Rock-Hewn Church and in tiles adjacent to it.
Specialists add +2 Faith, +1 Culture, and +1 Science each.