Ask him out, be honest, tell him you developed feelings
Smile back and say 'hi' back and touch him.
call him, sit next to him at lunch, have a friend tell him you are interested
Just tell him. Most guys like it when people are straight with them about things. It removes so much confusion and uncertainty. As long as you aren't aggressive about it you won't scare him away. It's always better to be direct and honest when it comes to these topics.
Try getting him in a room (alone with you) and go under a mistletoe and make sure the mistletoe is obvious.
I was going to say get him drunk.. but uhm.. just be flirty and touch him
I know about that... I'm an EYE-talian... lol
Take him to the cemetery, dig up a young child, and discuss your relationship while dissecting the body.