I have seen this technique before, but I saw it again on Pinterest recently, and decided to play :-)
The idea is that you glue stamps close together on a sheet of paper, then cut out a shape.
So I glued stamps on to paper last night, giving them time to dry.
I don't know what other people do, but I figured the best way to get a good shape is to draw an outline on the reverse side of the paper, and cut it out from there. I chose to draw a rooster.