Scuta

[Matt Lukes]

Would a wreath in yellow be "accurate" and would raw hide as the material be more likely or less likely than thin brass foil for the design.

"Accurate" isn't really an appropriate term to use for scutum colors since we have no idea what they really were- everything is theoretical. Green is reasonable because leaves are green, but there's nothing that would preclude the use of other colors I think. And there's scant evidence of metal applique pieces on scuta (just a couple of artifacts that I don't believe can actually be proven conclusively to have come from scuta), paint is rather more likely to have been the most common form of decoration. I don't believe there's any evidence whatsoever of rawhide- assuming you mean some kind of raised, shaped skin- as decoration.