As default, area color of shapes is "Tango: Sky Blue 1", but there is no setting to change this default color.
Following 2 ways can be considered to solve this.
1.Add option like "Set Autoshapes defaults" in Microsoft Office.
2.Add "Drawing Object Styles" to "Format and Settings" in Writer and Calc. (Impress already has one)
Reproducible with LO 126.96.36.199, Win 8.1
In IMPRESS draw a shape like a rectangle and make a right mouse click on it and go to EDIT STYLE tab AREA. There you can change the default colour for all the following shapes. Something like this seems not to be available in WRITER and CALC (at least it is not known to me).
-> Changed to Enhancement Request
*** Bug 120937 has been marked as a duplicate of this bug. ***
This subject has come up repeatedly in Ask-LO and it would be great to see the change. Surely this cannot be too complicated, and in fact I find it odd that this request has not been implemented already. Please ...