We started with a 12x12" black construction paper for the warp and used 1", 1/2" & 1/4" wide strips to weave into the warp for the weft. We began with the largest strips then over-wove the medium and skinniest strips on top. The end of each strip was glued.
I then showed them how to weave vertically just the medium and skinny strips and glue the ends of those strips. They could use random colors or limit their color palettes. This is a lesson that is always successful and the kids seem to really like the finished work.