The first thing that popped into my mind was an Eastern King in bad lighting (like at dusk or in a dense forest). Something like that could easily be mistaken by a non-herper as "blue with white rings", and the size would probably be exaggerated a bit as well.

Sort of like this:

k.b5z.net/i/u/2179965/i/EasternKingsnakeJJ18.gif
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- Natalie
(San Francisco Bay Area)

1.0 Banded California King
1.0 Mexican Black King
1.0 Bay of LA Rosy Boa
0.1 San Ignacio Rosy Boa
0.1 Ortiz Rosy Boa
2.3 Kenyan Sand Boas
0.1 Saharan Sand Boa
1.2 Rubber Boas
0.1 Pickering's Gartersnake

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