I'm dissatisfied with the cloud renderer in GIMP. The local texture is nice but the clouds tend to line up along the diagonals, often egregiously so. The best I can do is try multiple seeds until I find one where these artifacts are minimized (but not eliminated).

I rummaged around on the GIMP plugin registry but did not find any replacement cloud renderers.

Does anyone know of a better plugin/script/secret incantation that I can use to get good clouds?