Pull out the ballista I keep in my back pocket (because the GM can't be arsed to remember the encumbrance rules) and shatter the wall.
Plan B: Shove a portable hole into my bag of holding (or is that the other way around?) to get sucked into the Aetherial Realm and then use Ethereal Jaunt to go back to the Material Plane.
Plan C: Kill enough rats to gain two levels. Put one in Bard and one in Shadowdancer. Cast Light and use my own shadow to jump out of the room.
Plan D: Manifest astral traveler or astral caravan, depending on how many people are present. Walk out. End the effect.
Plan E: Upload my mind into the Net. Contact someone on the outside to build me a new body. Download into the new form, leaving my old body to rot.