Is there an IDE out there that does structural syntax highlighting?

Question

Somewhat inspired by this question about a graphical programming environment. I don\'t think that C++ or C# are really conducive to this type of environment, but perhaps there\

Answer 1

The closest thing that I've seen is Codekana, although doesn't have "background syntax-highlighting" it colorizes the different flow-control structures:

_{(source: codekana.com)}

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_{(source: codekana.com)}

• Red for loops
• Green for if-blocks
• Brown for else-blocks
• Aquamarine for switch-blocks
• Olive for exception blocks
• Orange for 'return'