Ha! Solved it. It was SET to print to B/W all along. To change it, pick a webpage (for example) to print. In your printing options, select
"Print to OneNote 2013." In the next screen,
look for a toggle/button/checkbox switching between printing in Color or Black & White. Select Color. Print to a test page somewhere in your OneNotes. It should now show up in color.
Then, try the "insert printout" thing (the original problem asked about), and it too now inserts the printout in color. Far out.
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One other thing: for lengthy printouts, to prevent that really annoying default of printing each page to a different OneNote page ... Go into OneNote's Settings (File->
Options -> Advanced), scroll down toward the bottom, find the
Printouts section, and UN-check "print long printouts to separate pages" click OK. Now it's all on one page. Cool beans.
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Wow. My first solve. Do I get a T-shirt or a new car or something? ;-)