Start by creating a new file of header size. Apply a nice gradient as shown below.
From “Filter” menu select “Distort>>Wave”. Apply settings as shown.
Press Ctrl+F twice to reapply the filter with same settings.
Create a few multicolor circles as shown below.
Create a big white ellipse and apply some drop shadow layer style.
Duplicate layer. Scale down, remove layer style and fill with a dark gray color.
Create a series of four circular buttons using same technique but with much smaller size and place as shown below.
Create a few vertical lines of varying width. Decorate with tiny green circles.
Create a medium size ellipse and place as shown below. Use same technique as explained above.
Duplicate all layers. select and merge all duplicate layers. Move this layer right above the big gray ellipse layer in layer order in layer palette. Move this layer towards left. Press Ctrl+Alt+G to create a clipping mask.
Change layer mode to luminosity and opacity to 18%.
Insert a relevant image and place above the white ellipse.
Populate the header by inserting company logo and link names.