I will try to post my Index Astartes soon. It's lengthy and still needs some editing, but it's a good read.
The chapter has a Second Veteren's Company called the ValeGuard that are somewhat detached from the chapter's "Death before Dishonor" esprit de corp. They have a Xeno-hunters slant to them and have a seedy alliance with some of the more deceptive and underhanded cadres in the Tau empire. This has really allowed me to push the chapter's story forward and further embolden the idea of them being an army design around Air Cavalry (Storm Ravens Look a little pale when a normal marine army can have Storm Talons, Storm Eagles, and Assault Rams.) It also gave me the opportunity to do something I've always wanted to do. Build a Marine army fully in Truscale.
I'm a big fan of the mk4 Maximus Head and found a guy who produces this Tau-Power armor hybrid which happens to be design in 28mm Truscale(or darn close to it)
Below are some of Prototype models I have showing the larger Mk 16 Damocles power armor and their non-standard Bolt weaponry. While I very much like the GW aesthetic, I find myself seeking out non-GW bits to give my armies some individual flare.
(There are actually three different guns types in the above picture. The one on the far right is a carbine version of the first and third.) I have about 40 figure s currently and want to get another 20.