Sorry if similar questions have been posted before or if this is more suitable for the army list forum, but I'm just looking for suggestions for builds and tactics for a fluffy 
IG force.  I'm thinking of collecting guard but fancy some allies just for the diversity of units and allowing tactics other than gun-line and vendettas with late game objective grabbing squads and mech guard.  Quite fancy having some elite infantry and units that allow me to cause distractions in my opponents backfield so was considering a guard gun line with drop podding grey hunters and wolf guard to threaten the rear but this seems very over used but reading fluff it would make a nice survivors of the 1st Armaggedon war for, a theme I quite fancy using.  I'm trying to keep away from using psykers as I'm going for the idea that in the aftermath of Armageddon they'd probably hate chaos and grey knights and have a mistrust of all things warp, also trying to keep exotic weapons to a minimum to show they are unsupported so plasma, melta and lascannon should be mainly for specific squads rather than common infantry.  At one point I liked the idea of throwing logan into a blob squad to anchor them down with 
ATSKNF  and allow versatility by granting tank hunters relentless and preferred enemeapons being hany for deep strikiy, as well as scoring wolf guard but alas on reading up on this found that it didn't carry other to allies damned 
FAQs 
 
 The other 2 allies I'm considering are a turn about face on my stance on psykers, Dark angels allies putting Azrael and a ML2 librarian in and Al rahem outflanking blob hoping to score endurance and enfeeble on the bio table for the novelty of aggressive playing guardsmen supported by deathwing.  Or using elder rules foe counts as units to represent the guardsmen having to improvise due to not having the support of the munitorium, so wraithguard acting as heavily armoured troopers dug in to hold home objectives their weapons being handy against deep striking termis and assault vehicles; pathfinders giving guardsmen effective snipers and a farseer with runes of warding whose powers I don't use to supply psychic defence; though I have to admit I'm not familiar with elder or how to effectively use psychic defence.
 
 Sorry for the vagueness of my post, to summarise I'm looking for:
 >Suggestions on builds and tactics that would fit the theme an 
IG force that is working with the might of the umperium behind it.
 >Unusual tactics or ally combinations outside of "stick a rune priest in it" 
 
 Not looking for super competitive builds just something unusual or with a bit of character, if it can put up a half decent fight that's a bonus.
 
 Cheers