Adobe Firefly
Adobe's commercially safe image generator, trained on licensed content.
Image
The model library most open-source image styles actually come from.
Civitai is a catalogue of community checkpoints, LoRAs and embeddings, and each entry shows the sample images plus the prompt that produced them. If a look exists in open image generation, it was probably published here first.
Licences differ per model and several are non-commercial, so read the label before shipping client work. Browsing is free; generation and private storage are paid.