Molecular background by Kasy
^^ inspired in Shadow cloud tutorial
1.- Make a New Document 400x400 px or the size you want
2.- Press D to reset Colours
3.- Then fill the background with black
4.- Then use: Filter > Texture > Grain and use the next settings:

5.- Take your Magic Wand tool (W) and select the black bacground
6.- Make a New layer... but DONT deselect the stars

7.- In the new layer go to Edit > Fill and choose color White
8.- Now in your new layer go to Blending options and use the next settings:


9.- Tadaa looks like a molecule ^_^

10.- Add some Hue Saturation or a Color balance Layer

Final Result