Visual communication course

I'm looking to do a short (one- or two-day) course in visual communication or the principles of design in an organisational/business context. Does anyone know of any such courses running in Brussels?

Apologies for the vagueness but I don't even know if such courses exist; my position is that I'm used to working with words but would like an introduction to basic design principles and work with images, which might or might not include some software training. Extensive internet searching hasn't revealed anything.