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Dollar Bill
Not sure if you are talking about this cuz i didnt want to watch through the stream
http://smashboards.com/threads/changing-color-effects-in-melee.313177/page-6#post-16892325
if so it is not a texture, but I gave marths Dair, 3rd hit of side B down, neutral B, charging smashes, and I think f smash darkness effects
EDIT: It also contains a purple and black sword trail, so if you dont like that, you are going to have to change it yourself
All you do is go to this offset in your hex editor
3948 - FF 00 99 00 99 00 00 00 00
and replace it with the FF 00 00 FF FF 00 FF FF FF