1) yup, tissue paper secure with rubber band.
2) cut a piece of panel light diffuser (those used in the office ceilling light), slightly bigger than the front of the flash head, secure with velcro. use it as a wide angle diffuser.
3) cut a white translucent plastic rectangle that can fit the flash head. use it as a softbox.
4) cut a rectangle piece of white plastic sheet about size of 2 CD cover, secure with velcro and use it as a bounce card.
you will need to expt abit to get best performance. happy DIYing.