I put colours instead of seas!

The colours (Black, Yellow, Red and Green) seem to be rather arbitrarily 'seas'. There's no real indication that they are supposed to be anything else but colours, except for the fact that otherwise black/white would be exchangeable with green tea. But then, there's also a movie called "Green Sea', so even then it would be somewhat arbitrary, except that the other 'seas' are actual bodies of water. So, yes, it works after a fashion, but it's a bit inelegant.

The seas group could equally be other things, e.g. snooker or pool balls. Otherwise OK

Too many other things the colour seas group could be (and have been in other grids here : colours, snooker balls etc) I understand the red herrings for teas and the blue in depressed, but it's way the weakest group in an otherwise enjoyable grid...

White sea????