Color of selected cells

I can select non-contiguous cells by holding
down CTL then left mouse button and dragging.
Selected cells turn pale blue with the blue
color scheme.
Release mouse button and CTL, do same
for next group of cells, to add them to the
selection
Can I retain the blue color scheme but have a
chosen custom color for the selected cells,
to give a bit more contrast?
Can't see anything in Options.
Excel2007