I just started using the Phpmyadmin Designer feature today and the only thing i haven't been able to figure out is why some relations are drawn in different colors.
All relations that reference a bigint(20) to bigint(20) are yellow and it would make sense if colors indicate how big column types are... but some int(11) to int(11) relations are green while other int(11) to int(11) relations are pink. And i also have two int(6) to int(6) relations one of which is blue, the other one is turquoise.
I'm not saying it annoys me or that i "dislike" the colors or whatever. But they obviously mean something and i'd like to know what it is?