Hello!

Here's `color-blend', a function to blend two colors into one.  The
patchset also replaces `vtable--color-blend' with `color-blend'.

Examples of this function being implemented separately in the wild:

https://github.com/alphapapa/prism.el/blob/2fa8eb5a9ca62a548d33befef4517e5d0266eb28/prism.el#L1044
https://oremacs.com/2015/04/28/blending-faces/

Thanks!

Joseph