Choose the next tool and draw a stripe directed form left the right side, colored in 0072FF.

Using the same instrument, create one more stripe of the next color – 4799FF.

Apply this instrument to create another stripe colored with 2B5B97.

Download from http://www.deviantart.com two sets of brushes “evil_bloodsplat” and “Tree Brushes By BlazteR”. Copy them on the: Program FilesAdobeAdobe Photoshop CS2 (or another version)PresetsBrushes.
Choose the next brush and click on the right mouse’s button on the picture and choose from the column shown on the right side

Load one by one the brushes!
Create now a composition like the next one. Each element must be put on a new layer, selecting the black color and choosing the appropriate brush in all cases.