Like lots of other people, I've been playing around with AI generated art (text to image). In my case, I've been using Stable Diffusion UI. Stable Diffusion UI is an easy to install variant of Stable Diffusion that also includes a graphical user interface. I was able to get it running on both Windows and Linux without much effort. While the included GUI is nice, the easy install was what appealed to me the most. Some versions can be a pain to install and setup.
To get faster results you need a decent GPU with lots of VRAM. However, a GPU isn't necessary to use Stable Diffusion UI as long as you have a little patience. If you don't have a GPU and use only the CPU, each image will take much longer to produce. It can take thirty minutes or more depending on your hardware and the settings you use. However, this is open source software so you can generate as many images as you want for free. The end result is that even with limited hardware, you can still produce unlimited images as long as you are willing to wait for them.
One of the common themes I've used when creating prompts is "cyberpunk". This prompt can produce images with a near future theme, retrofuture theme, or a more distant future theme. Like the last one, I would say this one appears near-ish future though this one is a little less ominous.