With Psalm 139 I often use "So Beautiful" by Urban Myth Club. iTunes Australia has some of their tracks but not this one - you can buy the album from the US store or their website. a great album of chilled electronica.
I play the song with a clip of a foetus in the womb from "The Human Body", and read phrases of the psalm aloud during the gaps between the song vocals.
I realise that I posted about this re the deacons worship - I thought I'd add it to my "Soundtrack" category, the idea being that you can go there and search on a text or band,