Easyworship is a popular piece of software for projecting the words of songs and sermon presentations. A lot of churches use it, and a lot of churches over use it. It has the ability to project moving backgrounds behind the text. This is one of those cool ideas that tends to be over used and distracting.
We were attending a church and one Sunday they had a different moving background behind just about every slide. I asked the computer guy after the service if they had gotten a new background pack. He said that they had. And they used every single one that Sunday.
Don't do this. Please. If you absolutely need to use a moving background, then only use one. I'm not a fan of using any moving background myself. But that's just my opinion.
The important principle here is to make sure that whatever you project will get your point across and not distract from it.