What you first have to realize is that most of the Windows Movie Maker effects are designed for moving images. When a video effect is on a still image. it becomes even more noticeable, even the main focus of the clip. Things like Film Age and Hue and Cycles Entire Color Spectrum have such motion to them that they will dominate the screen when on a still image.
This can work for or against you, depending on your purpose. If you want to spice up a clean still image and meld it into a larger whole strong moving video effects may help. If it is important for the audience to see the image clearly then you might want to stay away from these.