What is a good contrast text color on a black background? White. What about on a white background? Black. What about on #f06d06? Less clear. Devon Govett posted a good trick to having CSS pick for you, which works across browsers today. Lea Verou has a much deeper dive. There is supposed to be a CSS color-contrast() function, but it’s not usable across browsers yet.
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How to Create 3D Images in CSS with the Layered Pattern
Repeat the same content over and over on top of each other, and you can move each of them just a smidge in 3D space creating the illusion of shape.