Hello Tom
Happy near new year! :)
As you can see above my 2 favorite are (till now) Gaugan2 (by Nvidia Labo research) and Wombo
http://gaugan.org/gaugan2/
https://dream.ai/create
Both are free Online (no limit of number images) and very simple to use!
Sure limited in size but with some other free AI you can increase these images result XY limits!
Gaugan (1024 * 1024) Wombo1080 * 1920 frame include
Both works on very old computer ( PC ten years old! )
And very speedy...for me :) 5s / image (Wombo) ! 2s (Gaugan)
All try of other local Ai was a nightmare for me...and falls! :(
Too big and long install....
And it's not my spirite of computer use...too many parameters to input! :)
Life is too short! :)
Gaugan is very tricky by its 32 colors materials see my Gaugan pages! :)
https://moiscript.weebly.com/gaugan.html &
https://moiscript.weebly.com/gaugan-365.html
Wombo by its 50 free "Styles" ... see my Wombo page
https://moiscript.weebly.com/wombo.html
(from a week Wombo has "Premium" functions/styles) but keeps 50 free styles... :)
About design and architecture maybe this trick of Wombo can be used from any Moi image!!! (or any image)
You can input an image and give a % slider of following for the render! :)
Else my last advice will this one: use the fabulous free Lexica.art!
https://lexica.art
It's the The Stable Diffusion (another graphic Ai) search engine but as you can copy any Prompt... :)
You obtain in one second 2500 images minimum on any subjects!!!
Here Bridge / Calatrava : of course quasi nothing is from Calatrava but...you have some moments of inspiration!
https://lexica.art/?q=Bridge+calatrava
And as you can click any image for again 2500 images of the style of the clicked image...you must have nine lives for all see! :)
This search engine image is for me the best one at this day! Ergonomy, speed etc...
You can of course also create your own prompt for input in your favorite AI...
I believe that you can talk also with an free Ai chat for help you in ay subject : )
https://openai.com/blog/chatgpt/
So ask (him she it) something as elaborated prompt! Any languages! :)
Have funny discovery!
for prompt architecture design ... style Sureal (wombo)
for color style Building (Gaugan) no prompt
Ps NightCafe another free one but just 512*512 and 5 free images / day! :)
https://nightcafe.studio