I do think yellow lightning could still be cool in a Rey Palpatine version.
I was spending some time today figuring out how I could pull off yellow lightning for you, but it seems it would require tons of frame by frame masking as we are dealing with thin, blue and white elements against a blue and white background. I do however wonder if Skenera would be able to do it, after seeing what they had done with Leia’s saber!
What do you think Skenera? Is it as difficult as I say it is? 🤔