That is seriously cool. I'm picturing a wall hanging, some sort of lace pattern, with continually changing colors of fluid moving through it (I have to agree the red is a little too blood-like though!). But it looks a little difficult too - tubing flexible to knit but not so soft it would kink.

That really got the creative part of my brain up and running this morning!

Ohh - another idea - for kids who have to have blood draws, little animal shapes or something in the tubing as a distraction from what's going on. Like a silly straw. Never could convince my kids not to look while it was happening, so better to give them something different to look at?