There's a feat from XPH, that is probably worth considering.
I think the feat could be interesting for a rogue. The only problems with the feat, is the short description (does it require a cloak to use?) and total lack of relevance for the XPH.
I've never seen anyone mention this feat, even though giving oneself a nonmagical form of concealment for the cost of a move-action is kinda cool.
CLOAK DANCE [GENERAL]
You are skilled at using optical tricks to make yourself seem to be where you are not.
Prerequisites: Hide 10 ranks, Perform (dance) 2 ranks.
Benefit: You can take a move action to obscure your exact position. Until your next turn, you have concealment. Alternatively, you can take a full-round action to entirely obscure your exact position. Until your next action, you have total concealment.
psychic warrior4/rogue5 w. hustle (power) and cloak dance (feat). 10 ranks hide, 2 ranks dance. yeah... a terrible build, but w. the right power choices, and feat choices it could work.
Now i just have to figure out if concealment is enough to trigger a sneak attack. probably not...