Another tutorial.. Simple and fast..
STEP 1=open a new document 1000 px / 1000 px and fill it with black
STEP 2=create a new layer (put it in the top) and fill it with white
STEP 3=go to filter >> render >> fibers and apply the following settings
STEP 4=go to filter >> blur >> motion blur and apply the following settings
STEP 5=apply a gradient overlay layer style. with the following settings (remember to set the effect to overlay like shown in the box)
STEP 6=convert the layer to a Smart Object and duplicate the layer; set the layer to Overlay and go to filter >> other >> high pass and apply a radius of 10 pixels
STEP 6=set the black background layer as invisible and merge visible (shift+ctrl+E); than resize the merged layer as shown in the picture
STEP 7=free transform. the merged layer rotating it of 45 degree and stretching it to the corners
STEP 8=go to image >> adjustments >> levels and apply this settings
FINISH=apply any effects you want to personalize your image
