Fast character concepts:

Factotum: Cowardly or non-combat-oriented Human Rogue (maybe hybrid Wiz/Rogue?) with scads of skill- and knowledge-based feats, powers, etc.

Warforged Paladin: It was crafted exclusively for the purpose of vanquishing evil(a bit singlemindedly driven)

Warforged Cleric: It calls its deity 'Gran-dad' since its race was created by mortals. Faith is hard-coded and unshakable.

Warforged Battlemind: This is a psychic robot with a HUGE hammer that can walk across water at level 2. Multiclass into fighter for more defender goodness.

Warforged Druid: a golem made of fallen deadwood(or a single living tree) that Transform(er)s into animal shapes to fight. Appropriate sound effects not optional.