Cool desktop backgrounds
Wallpaper requests sit outside webcam-mic evidence. Here is the limit of that answer and the next audio step if you meant speech capture.
What this query can and cannot answer
No supported list of cool desktop backgrounds can be given from the material on hand. The query is about wallpaper or other still images used on a computer desktop. That is a visual choice. The available brief is about microphones built into webcams, audio-input selection, conferencing compatibility, and voice-quality evaluation. Those topics do not document named wallpapers, image sets, styles, resolutions, or sources. Without that evidence, recommending specific backgrounds would be invention.
How this relates to webcam speech capture
A desktop picture does not select the microphone, set input volume, or change how a webcam mic records speech. If the goal is voice on a call, meeting, or recording, the next action is to confirm which audio input the conferencing or capture app is using—typically the webcam’s built-in mic or a separate microphone—then speak a short test and listen back for level, noise, and intelligibility. Wallpaper remains independent of that check.
If the intent was a video background instead
Some people use “background” to mean the scene behind them on camera, including virtual backgrounds in conferencing software. That is still a video effect. It does not replace choosing the correct audio device or judging whether the webcam microphone is picking up speech clearly. Evidence here does not name conferencing products, virtual-background files, or measured effects of those effects on voice quality.
What is missing
This brief supplies no documented wallpapers, no reported observations of particular desktop images, and no measurements tying screen art to microphone performance. Gaps include which operating system or app you use, whether you meant wallpaper or an on-camera virtual background, and which audio device you need to keep or change. A supported wallpaper answer would need an image catalog or design brief. A supported webcam-audio answer would need the input you currently have selected and a simple spoken test in the app you actually use.