Showing interest in a guy always gets his attention. Like, dont just as k what music he likes, what specific songs, shows your actually interested in him.
Flirty jokes (wierd name, I hope you get what I mean). You know the little jokes ppl make when they are flirting, the hints....
Physical contact usually gets a guy interested. Mighn't get him thinkin your flirtin, but might open his eyes a little.
hope that helps a bit.