Blending Options-Gradient Overlay (for the green one)

Create Microsoft Windows Vista Wallpaper in Photoshop CS

Gradient?s parameters:

Create Microsoft Windows Vista Wallpaper in Photoshop CS

Blending Options-Gradient Overlay (for the yellow one)

Create Microsoft Windows Vista Wallpaper in Photoshop CS

Gradient?s
parameters:

Create Microsoft Windows Vista Wallpaper in Photoshop CS

Select now the next instrument to represent the element giving the sense of volume on the picture.

Create Microsoft Windows Vista Wallpaper in Photoshop CS