I would try putting fabric up on the walls and ceiling. Go to the fabric store when they are having a sale and pick out several matching colors that go with your theme and staple it up on the wall. Make sure you measure and get plenty of length. If it's too big of a task to cover all the walls with fabric, perhaps frame a window with a vibrant color and paint the walls to match or hang a canopy from the ceiling (hang it low enough so that it hits the ground).
Next I would throw many large pillows on the floor.
Paint the walls with some vibrant colors to match the fabric and pillows.
Here's a link to something that might be similar to give you some ideas: http://ratemyspace.hgtv.com/SNC/ViewItem.aspx?pguid=6db6be3f-1720-4ba3-a081-999042c09b6b&itemguid=d97a61f0-a51c-4a34-a9a3-0db400d41511
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