As noted here (http://www.adobe.com/designcenter/photoshop/articles/phscs2at_selfedit_02.html):

“If we used a Hue/Saturation layer or a Curves layer, we’d almost certainly apply it at 100-percent opacity, so if we needed to make the effect stronger, we’d have to tunnel into the dialog boxes. Color Fill layers, on the other hand, always use fairly low opacities, so we have an immediately available adjustment to make them weaker or stronger using the layer opacity—we only need to open the dialog box to adjust the actual color.”

The flower at the end I think looked much more alive originally. It now looks like an anti-depresent commerical.

Personally I think that Adbobe is wasting my harddisk space for some of these blending modes, brushes, shapes, and other useless stuff that I’ve never seen used professionally. (May be wrong though)