Here are some ideas if you haven't got a pattern:
Knit blankets for prem babies approximately 12" or 24" square (garter or stocking stitch is fine, colour[s] unimportant)
Knit bonding squares for prem babies approximately 5" square (garter or stocking stitch is fine, colour[s] unimportant). Make in pairs: one is worn inside her bra by the mother, one is with the baby then they are swapped over.
Knit cannular sleeves for prem babies: knit 26 stitches and 36 rows with 4mm needles or similar to make a rectangle approximately 10cm x 7cm (or 4" x 2 3/4") (garter or stocking stitch is fine, colour[s] unimportant) then sew up the sides leaving the ends open to form a tube
Knit or crochet a 40" square blanket for patients who are terminally ill using any stitch or pattern, in one piece or with a number sewn together (preferably in cheerful colours)
Knit or crochet hearts for terminally ill patients and bereaved families: there are lots of free patterns and tutorials online, try and make them about 3" wide