P.W.
good old fashioned Hallmark.
My MIL has cancer and I send her a card a week. Nothing about her illness really. Just pretty cards or cards that say "thinking of you." She loves this!
Knit something cozy if you are a knitter. Or my dear friend actually made me an adorable fleece blanket for me when I was sick once. She just bought the material and then tied off the edges. It is wonderful and I still use it. In fact have to fight my kids for it.