Good ideas. Just wondering what you mean for #1, "no solid material with decor over top". What exactly does that mean? A big piece of diamond? Or small solid quantities "painted".
Also, correction, for first line, second paragraph: uneeded should be "unneeded". Lol, no offense.
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For he's a Grammar Communist!
What would you say about space art? It isn't dmnd or anything like that, it is using the glow of certain things such as gases.
Here is an example if you are wondering