My own Terminator Lord has the following:
Mark of Nurgle
My style of play tends to be centered around deep striking termies and daemons. Hence, personal icons tend to be on all of my units. I usually attached the Terminator Lord to some plague marines, march them up to a key enemy unit, have him detach and deep strike a unit of termies. Combi-melta comes in handy if you get in range of a tank (took out a baal class predator in a recent game). Plaguebringer is good for wiping tougher units like carnifexes, hive tyrants and the like cause of the auto-wound on a 4+.
"There is a cancer eating at the Imperium. With each decade it advances deeper, leaving drained, dead worlds in its wake. This horror, this abomination, has though and purpose which functions on an unimaginable, galactic scale and all we can do is try to stop the swarms of bio-engineered monsters it unleashes upon us by instinct. We have given the horror a name to salve our fears; we call it the Tyranid race, but if it is aware of us at all, it must know us only as Prey."