You can do this. First, create a composition to house all of your video clips. Next, you are going to have to choose the length of all of your clips. Each clip MUST be the same length for this to work. Next, place your clips into the comp and sequence them. Now, put that comp into a new comp and add a solid and apply particular. Set up the particular parameters as you see fit. Then, under the particle type parameter, choose either sprite or textured poly. Next, choose video clip as your timesampling and use either loop, play once... and then set the number of clips to the number of video clips in your precomp. That is it.