Need Plexiglass help

I'd say some form of sharpie pen that you would colour it in, or the kind of tinted acetate that you sometimes find on sweet wrappers?
 
From what I see, it looks like the blade is quite thick. I have a question do you plan to light the blade up? If so you could use the lighting to tint the Plexiglas. Also It might look better if you layer the graphics on different layers of the Plexiglas. To make it seamless use IPS Weld-on # 4 Solvent Plexiglass Acrylic Glue.
 
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