I decided, for the heck of it that I would do a little clean-up on the image at the Ubuntu MATE front page. The couple things I did;
- Cut in half and flipped the MATE logo
(to remove its shadow) - Cut in half and flipped the heart
- For the one with white, inverted the math signs.
Drop either one somewhere on your image. Or, even cooler yet, use it in a Conky theme so all of your images can have either of the images on top of it, without any editing!
(For the second one, They're there, trust me.)