Expression need for display problem

[fippy]

I’m a web designer looking for a little help with a display problem. I’m trying to create a 4 column display, where the first row is:

blue green blue green

and the second row is reversed

green blue green blue

the third rows then mirrors the first and the pattern continues...

I’m looking for an expression/equation/rule so that I can color each box...

I hope I’m posting in the correct place (please advise if not)

[Guest]

Let "0" represent "Blue" and "1" represent "green".

Then the rows are
1010
0101
1010
0101
etc.

It looks to me like $A_{ij}= 1$ if i+jn is even and $A_{ij}= 0$ if i+ j is odd.
i is the column and j is the row and the counts start with i= 0 and j= 0.