How to increase the shading when highlighting mult. rows w/ mouse

In the Excel 2007 (which I've been using for six months and absolutely hate)
how can you increase the contrast when highlighting multiple cells on a
worksheet. If the cells aren't contiguous there is no way to see which cells
have been chosen since they appear the same as the unhighlighted cells. Same
goes for highlighting multiple tabs in a worksheet. The graphical user
interface of 2007 is terrible, this feature makes it even worse (if that's
possible!). I mean, seriously, who designed this new Excel? At least the
option should be given to use the old interface.