There is no such thing as a "leucistic" leopard gecko...it's a common misnomer. A leucistic animal is bright white with black or dark blue eyes. Neither the blizzard or the patternless morphs fit the description of "luecistic", thou the blizzard is close.

From what you've described, it sounds like you have a blizzard. They can range from white (rare) to grey (common) to dark gray (called midnight blizzard). It's also possible to have yellow blizzards. I commonly refer to blizzards as "mood geckos" as they can change colors dramatically depending on stress and temperatures. If you keep the temps in the right area, and keep the stress low, most likely your gecko will stay bright.
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Official Leopard Gecko Herder

6:12 Leos Getting to have too many to name here!
2:0 Cats - Troi and Mitsu (shhhhh...don't tell them they're neutered!)
4:0 Betas - So pretty, yet so violent!
1:0 Husband - Eric (He's a lot of work, but it's worth it.)

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• New Leucistic Leopard Gecko! - Reptile-fanatic, Wed Jan 4 17:30:25 2006
• RE: New Leucistic Leopard Gecko! - PR1090, Wed Jan 4 18:08:29 2006
• RE: New Leucistic Leopard Gecko! - kendergirl, Thu Jan 5 01:59:29 2006