Foreground to a color from your Tube and your Background to another color from your Tube
Click on the Foreground Color again and change it to a Foreground-Background Gradient ... with these settings
Flood Fill layer with your Gradient
Effects> L en K> Paris ... with the following settings
Activate your Preset Shape Tool ... with the following settings
select a preset shape of your choice (I will be using Star 2)
Anti Alias - checked
Create as Vector - checked
Line Style - Solid
Foreground color - Null
Background color - White
Draw out your preset shape onto your canvas (look at stars on my tag for a rough size)
Objects> Align> Center in Canvas ... Layers> Convert to Raster Layer