I love opaque wire. It gives a totally different impression than metallic ones, looks unusual, different than anything else. Unfortunately it doesn’t come thicker than 0.7mm, which is far to thin for a base wire, so I only have the thin one for wrapping. The base is still shiny and it shows when the wrapping isn’t dense enough. Still, it looks unusual.
This wire coincidentally was very similar in colour to some of the dyed agate I have.