Photoshop, image, adjustments, hue/saturation. Then this icon will appear on the screen, if you mess around with the scale the colours will change, for example:
Design 1
Original design after being mirror repeated.
Design 2
First design after playing around with the hue/saturation bar.
Design 4
Design 5
Design 6
All these designs are from the original design at the top of this page and just by using hue/saturation and it has created a range of different coloured designs making them look completely different.