Jeanne's Tea Room has the perfect winter companions, hot water bottle cover creatures, called Comfort Critters! I could tell you all the reasons why, but I think Jeanne's Tea Room says it best:
"Both children with tummy or earaches and ladies with crampie time will rejoice whenever the Comfort Critter is brought out to help chase away the pain monster!"
Sounds good to me! I'd get the Ninjas, but you know you'd never be able to find them, so I'll probably go with the kitties. They will always be on the bed, right?