I'm going to go ahead and make the rainbow log cabin that I put the link to in my first post (I like the rail fence as well and will probably make one of those eventually as well as I love the look of rainbow quilts--right now I am making an Ohmigosh quilt using 54 different batiks in the rainbow spectrum and will have lots of left overs from that).
I am just disappointed in the color of the current Moda Ombres--they are more 70's retro looking (lime green and weird plum purple and no yellow--although I saw Nancys Notions has a ombre that is yellow and orange and I could just use the yellow portions of that but I'm not sure it has the same sheen that the Moda fabric has).