Youtube Thumbnail / 3 seconds video design

Hi,
I have a new youtube channel with relaxing music, I need help to create some cute videos.
I am looking for someone who can create thumbnail / background like this
https://www.youtube.com/watch?v=AqJs8xrT7hE

I need the video / pic in 4k size.
If you can't make video, only design the pic is fine.

I need it ASAP.

See attached files for example what I am looking for.

Please share your portfolio.
Thanks.