The layer’s parameters: Fill 0%, Blending Options>Gradient Overlay

Gradient’s parameters:

The layer’s parameters: Fill 0%, Blending Options>Gradient Overlay

Gradient’s parameters:

The layer’s parameters: Fill 0%, Blending Options>Gradient Overlay

Gradient’s parameters:

The layer’s parameters: Fill 0%, Blending Options>Gradient Overlay

Gradient’s parameters:

Next we’ll select the Line Tool (U) and represent a cross of black color. Firstly we’ll represent a vertical line and then press Shift button to represent a horizontal line, applying the same tool.

Make many copies of the layer containing the cross. Using the Free Transform option, try to change the copies’ sizes and place them the way demonstrated next picture:

The final result!

View full size here.