Ok i'm gonna show you how to create a space like background with stars and stuff, it sounds rubbish but it looks very realistic, ok lets get started
Step 1:
First of all i want you to go make a new layer (if you want it put it behind a sig) or if you testing this tut go to new and create a new one doesn't matter about the size at least make it about 300x300 to make it big:
Step 2:
Ok then we go to Filter>Noise>Add Noise:
Step 3:
Ok now when you have that box up apply in these simple settings:
Step 4:
Ok now go to Image>Adjustments>Levels and apply these settings:
Step 5:
Well theres is no step 5 really just my outcome and hopefully yours too :