As far as I know, it isn't possible to curve the corners, but I wouldn't be surprised if it is possible, I just don't know how.
For colour, what do you mean by "page" forms?
If you mean what I think you mean, right click on the background of the form and go to properties (so its NOT the properties of the form).
It should be properties for "Section: Detail"
Then, under either the "Format" or "All" tab, you want to change the "Back Color" property.
If you use the little builder dots on the right, it will bring up an MS Paint type color selector.
Hope that helps.
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Give a man some fire, he will be warm for a day, Set a man on fire, he will be warm for the rest of his life.