This may work (a sort of round affair) but depends if you are having a lot of text with the pictures.
X X X
X X X
X X
X X X
X X X
Also remember pictures do not have to be in rectangles or squares so try this with a honeycomb structure. It locks together nicely.
Otherwise how about a Wheel with the pictures as an outer circle of circles and a line of text as a spoke.
You do not say what industry you are involved with for this so maybe there is something you can use as inspiration there? For example IT - Pictures attached to keyboard keys. Depends how serious this has to look - you say corporate so I suspect serious.