is it bad to have three references from the same lab?

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sleepyjean
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is it bad to have three references from the same lab?

 hello,
I want to apply for an NIH program for after I graduate.  The problem is that I am a very shy and quiet student and I never spoke in class and i've only worked in one lab, so I dont really have any professors that could give me a good letter of rec.. 
so I was just wondering, would it look really bad to have all three references from the same lab??
i think two of them would write me a really good one, because i've worked with both of them separately, and the third (the PI) would write an ok one, since i never worked with him directly

or should i ask someone outside of lab even though this person would probably not write such a good one?