Slide background art that text stays readable on

Create a background image for a {{16:9}} slide where the text sits {{left third / centred}}.

The rule that matters: the text area must be a calm, low-contrast field — one flat colour or a very soft gradient, nothing crossing it. All visual interest lives in the opposite {{two thirds / edges}}, and it fades out before it reaches the text.

Subject of the art: {{abstract shapes / a loose photographic texture of {{material}} / a soft illustrated scene of {{topic}}}}.
Palette: {{brand colours}}, and keep the text area either well above or well below the mid-tone so {{white / dark}} type clears a 4.5:1 contrast ratio.

No text, no logos, no faces, no busy detail, no vignette, no frame. Deliver it plus a version at 20% lower contrast for the slides with the most copy.