Step 1
pen adobe photoshop into size 400x400px
Go to pencil tool, set your colour to black ( #000000) & Draw randomly/freely like this:
Step 2
Use the fill tool with the same colour ( #000000).To fill in some random areas like this: 
Step 3
Now go to: Filter->Blur->Radial Blur and put these settings:
Step 4
Invert the colours by press ( Ctrl + i )
Should look like this:
Step 5
Now go to Filter->Stylize->Find Edges & Then Invert the colours again ( Ctrl + i )
Control+U or choose image layer adjustment
Finished product:
