Coming up with 256 Permutations?

I need to come up with an array of 256 permutations for this project I'm working on.

http://i.imgur.com/8PivX.png

I need an array of:

Code:

---

xxxx xxxx
xxxx oxxx
xxxx ooxx
xxxx ooox
xxxx oooo
.........
oxxx xxxx
oxxx oxxx
oxxx ooxx
oxxx ooox
oxxx oooo
.........

---

I know I can do this with 8 nested For Loops but I'm curious if there is another way! Thank you!

I guess this works:

Code:

---

        Dim Options() As String = {"xxxx", "oxxx", "ooxx", "ooox", "oooo", "xooo", "xxoo", "xxxo", "oxxo", "ooxo", "xoxo", "xoxx", "xoox", "xxox", "oxox", "oxoo"}
        For x As Integer = 0 To 15
            For y As Integer = 0 To 15
                Debug.Print(Options(x) & " " & Options(y))
            Next
        Next

---

Still curious as to other solutions