What color setting does Eclipse use for whitespace characters? Examples in the screenshot below are the little » glyphs representing tabs, and the pilcrow ¶ for paragraphs.

Basically, it is Foreground color + Transparency, there are no specific settings for whitespace characters.
Transparency is configurable in
Preferences > General > Editors > Text Editors: click 'configure visibility' link > Transparency level
Foreground color is configurable in
For Text Editor:
Preferences > General > Editors > Text Editors: Appearance color options
For Java Editor:
Preferences > Java > Editor > Syntax Coloring: Element > Java > Others
Other editors may have their own settings.
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