First off, I think those are both lovely fabrics, but I'm not sure they have enough distinct colors to be used for either OBW or 4PP. Each one is basically two colors plus background, and there is not much contrast between the two colors. In QuiltE's beautiful OBW there are at least 4 colors plus background. (However I wouldn't be terribly surprised if you prove me entirely wrong and make a beautiful 4PP with either one.)