Flags ?<br />
Fish ?<br />
The colours in your closet ?
Black and black.
If you are referring to clothing colors, then.<br />
black and white......always a good combo<br />
black and yellow? NO NO NO NO BLACK does not go 'with everything' as most folks think; it just does NOT....and least of all with yellow!!! so forget that one!!<br />
Blue and yellow? you're kidding, right? again, NO<br />
blue and white? also very good.......a winner....