How do I let a shy guy know I'm interested without scaring him off?

I like a shy guy but I don't know if he knows I like him or if he likes me back. I want to do and/or say something that will let him know that I want to be more than friends, but I think if I come on too strong he will freak out and feel really awkward around me. I don't want to do something obvious like telling him how I feel, I want him to realize it on his own first before I tell him. What should I do to let him know that I'm interested?
How do I let a shy guy know I'm interested without scaring him off?
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