I make heavy metal or video game themed quilts or quilts with a lot of black in them.
I think there is a need for this type of charity quilt. Not just young children are in hospitals, teenagers are there too. Shelters are a good option, too. I don't see many charity organizations geared toward teenagers. Maybe you can call your local hospital auxiliary and ask if they have this need? I think a teen would love a heavy metal/video game themed quilt...much more than a teddy bear or choochoo train quilt that was made with a young child in mind.
One of the ideas I had for a charity quilt was a pink and chocolate rag quilt with pink rag edge applique hearts on the chocolate patches.
That sounds beautiful, but check to make sure your charity/hospital accepts rag quilts. Many do not.