CC0 Color page load-spinners

Looking for sources to obtain CC0 full-color page load-spinners.
Does anyone have anything links like this where the sources are CC0 and Free?

woud be great if blocsapp allow us to set up our own “spinner”.
Hope @Norm has this in mind for blocs3.
It´s a bit anoying to fiddle after each upload - but hey…
…still a great app