Images:

http://www.imageafter.com/image.php?image=b2elements025.jpg
http://www.sxc.hu/browse.phtml?f=search&txt=map&w=1&x=0&y=0
http://www.sxc.hu/photo/1171655
http://www.sxc.hu/photo/1153175
http://www.cgtextures.com/texview.php?id=24321&PHPSESSID=e450d5efb30ebb67077e09b3d6abd313
http://www.cgtextures.com/texview.php?id=17438&PHPSESSID=e450d5efb30ebb67077e09b3d6abd313

• Create a new document 1600* 1200 px, resolution 72 px/inch.
• Fill first layer with white color.
• Apply Gradient Overlay effect, just like in the examples below.

• Place night sky image into a new layer. Apply Auto Levels and Auto Contrast to it.

• Choose Screen Blending Mode and Opacity 70%.
• Erase central part of the sky using big soft brush.

• Make sky layer monochromatic.

• Place Earth planet image into a new layer.

• Apply Inner Shadow and Outer Glow effects to the planet.

• Paste Moon picture, apply Auto Levels and Auto Contrast settings to it.
• Choose Screen Blending Mode.

• Add Outer Glow effect.

• Paste white clouds image. Set Auto Levels and Auto Contrast.

Separate clouds from background.

• Go to Channels palette.
• Select Green channel.
• Duplicate it.

• Make it more contrast using Levels.
  • Choose Image > Adjustments > Levels.
  • Move left and right markers to the center a little bit.

• Load selection for Green Channel.
• Keep selection, Activate RGB Channel and return to Layers palette.
• 
  

• Add Layer Mask to Sky layer.
• Apply Screen Blending Mode.

• Correct clouds shape using Warp transformation.

• You should get something like this.

• Duplicate clouds layer, change Screen Blending Mode on Linear Dodge(add). Opacity 20%.

• Create shade from clouds.
• Load selection for clouds.
• Fill selection with black color in a new bottom layer.

• Move shade layer a little bit and reduce it size using Free Transformation.
• Set Fill = 0%. Erase superfluous areas of the shade around planet.

• Apply Gradient Overlay to shade layer.

• Create circle, Fill =0%.

• Apply radial Gradient Overlay effect.

• Merge circle layer with other empty layer.
• Transform created layer. Use Distort transformation.
• Erase bottom part of the rainbow.

• Duplicate rainbow layer.
• Choose Screen Blending Mode and Opacity 25% for one of them.

• For another one choose Lighten Blending Mode and Opacity 75%.

• Place tree image into a new layer.

• Rotate and transform it.
• Add some red apples.

• Insert more clouds images around the tree. Separate them from background just like in the previous steps using Channel Palette.

• Insert into a new layer a peace of grass.

• Transform it using Arc Warp transformation

• Duplicate grass layer many times.

• You should get something like grass circle.

• Duplicate grass circle and reduce it size like in the screen shot below.

• Erase superfluous areas.