From another thread some time back regarding the 'Donate' colour:-
Originally Posted by DH
....Cyan is probably the next best choice, but for it to be really noticeable, it's going to have to be green or cyan
This is just an example, it's just showing the different colours and what they'll look like, so disregard the links. Not expecting it to be implemented, but maybe you would like to trial it RCK to see what the masses think?