two different bgcolor on comment?

[streetart]

Hello

How I can make this?

comment 1                                  css-class a
comment 2                                  css-class b
comment 3                                  css-class a
comment 4                                  css-class b


I want change the backgroundcolor of the color to two different.

[Gizmo]

I've looked into this and came up short. You'd have to code it with I chose not to. Most themes use 2 colors, one for the posters name and one for the comment itself but I agree, we should be able to color alternating comment posts with different colors.