Some of the sources I have used.
Tecnicas Participativas Para la Educacion Popular, Laura Vargas Vargas et al., Alforja. The best handbook of techniques for popular educators also presents an argument for popular education as a dialectical method integrating theory and practice in the context of social and political movements.
Games for Actors and Non-Actors, Augusto Boal, Routledge, New York 1992. Great material -- a collection of games that explore a wide range of physical, emotional, social, and political motions and relationships.
A Book of Surrealist Games, compiled by Alistair Brotchie, Shambhala, Massachusetts 1991. Most of these are not readily usable in a language class, but those that are provide keys to creativity and imagination.
101 juegos musicales, Ger Storms, GRAO, Barcelona 1991. Interesting collection of participatory learning games mostly intended for use in music education, useful for practicing creativity, self-expression, and observation.