deke.com posts about psychadelic

Posterizing Colors Nondestructively in Photoshop

Deke recolors his Hair-inspired poster art using a nondestructive Gradient Map adjustment with custom gradient

Deke's Techniques 244: Creating Psychedelic Fabric in Photoshop

Deke uses nothing but Photoshop (a couple of gradients and its Wave filter) to create a psychedelic fabric effect in Photoshop.