/<path to blockland folder>/base/client/ui/FXjello.png
...
I came across this today while trying to find the correct size for CI images. (22px in height if any of you are wondering, and they do support alpha and should be in png format.)
This is not used to my knowledge in v10, but if someone would like to fill me in, that would be very much appreciated.
I am just curious as to what this may have been (or is) used for.
No I am not just too lazy to search. (See the picture below.)