Color a Shape the same color as a Cell - How?

Hi Everyone
I have some cells (x 13) filled using Standard Colors determined originally from the Format, Fill color picker of the cell Conditional Formatting rules.
Red, Amber (Orange), Green and a Grey.
I have triangular (Auto)Shapes superimposed on the cells.
How can I determine the exact color of each cell and apply it to fill the corresponding Shape?
In this condition I don't want the triangle noticeable - but for aesthetics (ie for other conditions) I want the colors used to be consistent.
All colors (both cells and shapes) will be determined by the contents of other cells.

Can't say I yet understand the differences, pros and cons between Theme Colors, Scheme Colors, RGB colors, vb standard colors etc. Matching Amber/Orange is the troublesome one.

With thanks
barry