Peaceful Vector Wallpaper

Create a new document, size 640x480.

Fill background color #a07f0d

Create a new layer, pick Polygonal Lasso Tool

Draw some sharp like this :

Fill this selection with #c9a62c color.

Pick Pen tool , draw a sharpe :

Pick Direct Selection Tool

Right click on each line segment and choose "Add anchor point"

Drag anchor point to make a curve...

Right click on this layer sharp, choose Rasterize Layer.

Pick Brush Tool , and choose this brush :

Brush on the sharp :

Create a new layer, name it Sun, put this layer under "grass field" layer.

Set foreground to #c03d09.

Pick Elliptical Marquee Tool

Draw a circle at this area :

Create a new layer. Download this brush : Vector Curves

Load brush to Photoshop, and choose this brush :

Click one time on the document like this:

Pick Eraser and erase a little on the right part :

Right click on this layer and choose Blending Option, set this option :

Load this gradient :

And choose this nice gradient :

Result :

Download this brush : Tree Brush

Create a new layer and brush a tree on the left :

Download this brush : Floral Vector 2

Create a new layer and brush some flowers on the right :

Download this brush : AK-VectorPeople

Create a new layer, choose a poser and brush on document:

Save this stock photo :

Copy it to document, put this layer on the top and change mode to Overlay :

Pick Pen tool and draw some curves :

Right click and choose Blending Option, fill a gradient as you like :

Click to enlarge

Good luck!