The four pictures above would then - for the whole session - all represent:
- The adventuring party
- Random encounters
- Loot
- Plot hooks
- Room descriptions
- NPC personality traits
- etc
For instance, you need to roll for a random encounter. Roll a 1d4 and either just use that picture as is ("You meet a knight in a never before seen armour; the knight waves at you and greet you all with a monotonous "HELLO EARTHLINGS!"), or rip off the various pieces found in the picture ("You find animal horns and hair - lots of hair").
(Now I need to get back to work. Ta-da)