Embrace denial for as long as possible -- keep making squares. (That's what I did the last time I noticed.)
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Buy yarn from a different dyelot and hope no one notices. (Tricky for the one that's discontinued.)
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Buy a coordinating yet obviously different shade of yarn and use at random, which could look really interesting when used to stitch the squares together. (Tempting.)
6 (66.7%)

Same as above, but plan ahead so the differently-colored squares look like they were supposed to be there and all the squares are stitched together with the appropriate yarn color. (Probably the right answer but requires effort.)
6 (66.7%)

Something that will be specified in comments.
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Make snowflakes instead. (Difficult to stitch into an afghan (but that'd be pretty).)
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