I'm not much of a artist myself and I don't know too many fancy tricks, but try this - 3 image layers.

1. Bottom layer is the container image you have now.
2. Middle layer is text(experiment with font). It could be a single color logo though.
3. Highest layer is cloned layer 1, except select and delete all but the "shadow."

Now make layer 3 somewhat transparent(30-70% I'd guess). Experiment with layer 2 being slightly transparent(mostly opaque).

If it looks good, merge the layers and save. I'm thinking that would look good enough.

uh, well. That post is like a year old now, but I could help you there.