Creative ideas, hmmm? Well......
Once, for a show in college, i recorded the pre-show announcement for a show. It went like this.
"Good evening, and welcome to the ___________Theatre Company. We would like to remind you that the use of any recording device is strictly prohibited. Please take this moment to turn off all cell phones and p--- (sound effect of cell phone ringing). Excuse me, just let me grab this a second. Hello? No, I'm in the middle of making a speech. (random conversation continued underneath the following). Please turn off all cell phones and pagers, and unwrap any cellophane-wrapped candies. Thank you,and enjoy the performance." The sound designer recorded me having a one-sided conversation, and then laid that down underneath the rest of my speech -- it worked pretty well!
Another fave of mine -- I worked on a new production of "Sense and Sensibility" last season, where the actors very much broke down the fourth wall -- talked to the audience, went in and among the aisles...and pre-show, they would mingle in the lobby and the house and talk to the audience members. When they were ready to start the show, a couple of the actors went down on stage -- and then the SM would call a cell phone one of the actresses in her purse -- and it would ring, and she would pull it out and say, "oh! It's time to start?! Okay, I'll make sure to tell them! Bye!" And then she would turn to the audience and say something like, "our stage manager would like me to remind you to turn off your cell phones, as they didn't exist in Jane Austen's day! And please no cameras or recording devices. That's all! Enjoy the performance!" It was so cute.
My usual speech for my compay is pretty blah...I've thought about ways to try to spice it up, but at a professional ballet company its difficult to do that, and maintain the professional nature of it that the bosses want you to have.
Try to match it with the show that you are doing...that's an interesting way to get the audience into the world of the play but still make them do what you need them to do.