Ideas to make our haunted maze really scary (but not too gory)?

We are creating a haunted maze for a fundraising event. We want it to be really scary for the kids (up to 14 years old) but not too gory so the parents won't freak out. We don't want to spend thousands of dollars on crazy animatronix and stuff. Know of a website with discount props and decorations or have some do-it-ourself iseas? please help! (helpful ideas only please)