We have to paint the background now. Using the Brush Tool for the beginning, we have to place the necessary colors' nuances on the appropriate places.



Blur out the colors, applying the next option: Filter ? Blur ? Motion Blur.



Change a little the nuance of the background: Image ? Adjustments ? Hue/Saturation (ctrl+u).



Choose now the Rounded Rectangular Tool to draw on a new layer, under the background's one the next element and then group out both layers (ctrl+g). Create a new layer situated under all the rest and paint it in black color, using the Paint Bucket Tool.