I thought I'd put up some pictures of a work-in-progress project I'm planning on working soon - a squad of approximately 8 Adeptus Astartes plus a Dreadnought (the Forgeworld Ironclad). The plan is to have each member of the squad to look very similar - in power armour marks, equipment and so on, with various details seeming slightly "off" - with this leader for example, his plasma pistol is non-standard, having been taken from the previously limited edition Inquisitor Gideon Lorr, but overall they will be "clean" enough to operate within the ranks of the Imperial Guard as a squad from a Loyalist Chapter.
The power sword on the leader is taken from an Eldar Figure (probably a Howling Banshee) - again suggesting non-standard (read: non-Imperial) technology origins.
Here's the first standard member of the squad, armed with a heavily modified bolter and short axe. Arms come from the Chaos Marine kits with extraneous spikes and other details removed. I will be moving these across to 30mm or 32mm bases when I return to work on the squad. I've used liquid greenstuff on the legs of this particular marine.
Looking at these pictures really makes me want to get back to these - perhaps once I get a few of my current projects completed I can return to build the rest of the squad and decide how to arm that Dreadnought!