I've started work on a force of Blood Angels that will hopefully become an Armies on Parade entry, and I've set it in the Siege of Terra, which is one of my favourite events in Warhammer 40k. The sheer scale and gravity of it, the fact that the Siege is where where the conclusion of one of the largest wars in the galaxy will be decided, and both sides know it. No quarter is offered, and none is given in one of the most vicious battles in the 31st millenium.
I was inspired to do this by frater OakRiver's excellent Crimson Thorns plog, and I've bought a Blood Angels Tactical Squad and sprinkled bits of MKVII to make my company seem like their armour has been patched together with a new and fresh mark of power armour.
I've been working on a Blood Angels Veteran Squad Member who is the test model for my army. His armour is about finished, and I'm quite pleased with it.