Clouds are easy in P6 and I guess it works the same way in P7.

In the material room you'll find a Node called 3D Textures.  CLouds are in there.  Just stick the node into the Diffuse_Color channel for a real simple cloud effect.  There are several parameters you can play around with in the node or, you can build up a more complex shader to get different effects, such as sunrise/sunset, storm clouds, overcast and so forth.

Lens flare is theoretically possible but I've never seen it done.  You could fake one with a transparent square and a shader or texture plugged into it.  For all I know, P7 supports real lens flare but I have never heard it mentioned.

Coppula eam se non posit acceptera jocularum.

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