Our application helps creating invoices and allows to insert an item into an invoice that represents a service performed by a craftsman. A typical service could be paperhanging or installing insulation.
One idea was to use some kind of tool as icon like , however, I believe this is inappropriate because we have similar icons representing application modules that actually deal with tools/equipment.
Another idea is using a shirt icon like (we'd create an icon that looks more like a work suit though), but I'm not quite confident with this concept, it doesn't imply manual work being done to my eyes.
Any suggestions? It should be possible to design a recognizable version in 16x16 px too.