Project Gallery
Here I was thinking we could have the photo galleries categorized by whichever means you think best. I'm thinking you can arrange them by customer, by work type, or by product used.
Anyway, these would be displayed as a list, and when the user clicked on one of the links, the gallery strip below would change to reflect that selection. So, if a user clicked on "Self Levelling Underlayment the gallery below would be displayed.