1. Best for patterned backgrounds, it uses CSS only for and you can easily adjust the size and color of the pattern with the css that goes in your .css file:

https://css-pattern.com/

2. Best when you need an a wave, blob, shape svg as an image or background. Outputs full svg for direct upload to WP media gallery as an image:

https://haikei.app/generators/

(outputs full SVG for direct upload to WP media gallery as image)


3. Best when a more complicated background iamge is needed. Outputs a png repeatable background image for use in a background-image capable WP block:

https://www.toptal.com/designers/subtlepatterns/thumbnail-view/

4. Best when you need a section divider that is a wave. Outputs css with a data-embedded svg (not external svg needed) for backgrounds. Can modify the css for different looks:

https://wavier.art/