The "K" stands for "Kryptonite" which was that stuff that supposedly made Superman significantly less "super".
If memory serves, Kryptonite is actually lime green, hence the name of this piece.
The large version can be enjoyed at the preceding link.
Today's Gratitude Item: "Super Dockets". These are minature vouchers printed on the back of some supermarke receipts. I found one which offers a good deal on accommodation in Wellington which is great because dance camp is happening there in October. The plan is to try and get everything (ie: plane tickets, accommodation and registration) "sorted" this weekend.