Thinking back to my bike wreck almost 4 years ago, I would have enjoyed a journal with a bright cover design and a set of colored pens. Stickers would have been nice also.
I read a lot. Most of my selections were children's books with encouraging stories and happy endings.
Other ideas:
Really soft pillows with washable cases because it was so hard to get comfortable.
Art kits/coloring kits/craft projects that are found in the children's activity section.
More than anything . . . it's just nice to have friends who think of you when you hurt and are struggling with pain and injuries.
Barb