People don't know what a "celebration of life" is (it's such a vague term) and if clear instructions aren't given, then they went with what they knew.
I went to a service, actually of a minister, that was a celebration of life though, and it was lovely. There was a video that showed kind of a story of her life to music, there were people who got up to speak, and nobody wore black. It was springtime so there were "spring colors" that everyone was wearing, and lots of flowers (not the funeral sprays but flowers). There was music, people sang her favorite songs, etc. At my great aunt's funeral, she was getting buried in TX because that's where her family (including husband and daughter) were buried, but she'd lived in MN for over a decade. Because of that, the preacher doing the service pulled us aside (the close family members) and said "I can do a general service for you, but since I honestly don't know anything about her, perhaps some of you can get up and talk?" That night I wrote a few thoughts down: just general key phrases that made us think of her (general enough that it could remind others of their experiences with her instead of just mine...it had everyone laughing out loud, nodding their heads, smiling about who she was), a cousin wrote a pretty poem, one lady (formerly a maid for my great grandma, but in our family our whole lives) said some very deep things (think "The Help" a decade before that book became a sensation) that really made us respect our aunt and proud of her. I think the preacher might have talked for 5 minutes, but that's it. It was one of the best funerals I've ever attended. We all went out to eat afterwards and caught up, laughed, had a great time visiting. Of course we missed her, but the funeral was more about family and I think it was fitting since she was a fun social kind of lady.
I am spiritual and love being a Christian. But I will be cremated (being pumped full of weird chemicals and stuck in a box...that's so unnatural and weird to me), there won't be much of a traditional funeral service for me. I totally don't want people being all uncomfortable and sad and feeling weird which is what happens at so many funerals. (Er...but I hope they're not HAPPY to see me go, lol). I want there to be some lightness, some laughs, remember me for what makes me who I am and celebrate some of the good things I've had in life, ya know? Life is good and should be remembered and celebrated. Don't have anything at the moment (just the wills and important stuff), but I reckon when I start getting older I could slip in something I'd like read (a favorite poem or excerpt of something, probably from Mark Twain or someone like that), what my favorite songs are and why, so that it'd be easier for whoever does a little service for me. I really like the idea of making an album from andvinyly.com where they can make an album (or a couple) with your ashes pressed into it, with either music or a recorded message in your voice, whatever. I think that'd be novel, but have no idea at the moment what mine would be or say. But do remember that a lot of the spiritual, religious, or traditional stuff makes people feel comforted. Whether you're into it or not, do keep in mind that it's a bit about helping the family and friends who are left say goodbye and feel a little comfort, as well as closure, to handle their own loss. In that respect, I think some stuff you see as a "funeral staple" shouldn't be banned, as long as it makes others happy, if that makes sense?
I like the idea that Laurie mentioned about having a service with live music in a park. Or wherever makes sense for the person that has passed on. It should be a little reflection of the person who's deceased instead of just a cookie cutter thing. But again, it's not really fair to expect grieving people to come up with something great unless you leave them some guidance to help them through it, or inspire them, ahead of time ya know? Like something kind of like a will of what you'd like, and arrangements made (like how people purchase plots and stuff ahead of time if it's important to them, so the family doesn't have to handle it). Otherwise, people who are grieving will leave it up to the funeral home or church to handle it, because.....they're trying to handle their emotions, not plans for "whatever". In a perfect world, you'd have time and the right mind enough to plan something great for yourself, as a final goodbye to your friends and family. That's not always the case, but one can hope.