I am working on this quilt now and while it's not a river, it has a "waterfall" effect.
http://www.joann.com/susan-winget-po...roject&start=1
Would look really nice in baby fabrics too, I think. The pattern is slightly wrong though (it seems they show the block assembly wrong). I haven't started piecing yet, just cutting the fabrics but I think it should be fixable by just placing them the correct way.