What are some way to tell him I think he's cute(: ? 10 pts!!!?

okay so i like this guy at my tinyy private high school but we're in different grades so i don't have any cles with him:( anyways he had recently changed his hairstyle and i was going to say to him while ping in the halls, "Hey _____! I like your new hair. It looks cute on you(:" and then keep walking. I went to school today and he changed it back to the way it was before! Ughh so now i cant use that line!! haha. The main reason I want to tell him i think hes cute is because i want him to ask me to prom and i know he wont unless he knows i like him. I would definitly prefer not to just flat out say it... trying to think of some more creative ways. all ideas are greatly appreciated (: but please no answers like "heyyyy yy! your smokin' (;" or something like that lol i would never use that! thanks soo much and God bless(:!! 10 pts!