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Favorite Answer
You could do a row of single or double crochet in each of the blanket colours as you probably won't need to buy more yarn. It will be lovely as it will be an original made by you.
N/A
Purple
Or (for an ironic twist)
Black (the absence of color)
Or (if they have/make/you can find)
Holographic/"prism-like" material
Otherwise I'd have to say Purple is your best bet to showcase your masterpiece :)
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I'll say dark purple.
Pearl
whatever color you want to have
angie
White like clouds