Create psychedelic pictures by flipping colour and tone in Elements
Open your picture and duplicate the layer. We’re going for heavy edits, so having a copy is useful in case you want to revert to your original image, or layer your original image over the final image, with an Opacity of 20%, just to lessen the saturation.
Head to Enhance>Adjust Color>Adjust Color Curves. In the Select a Style drop-down menu, choose Solarize. This will give the psychedelic effect: all you have to do now is adjust highlights, brightness, contrast and shadows with the sliders.
Duplicate the original layer and move to the top of the stack. Hit the mask icon, and press Cmd/Ctrl+I to invert the mask. With a soft brush, mask anything you want to remain unaffected by the edit. This could be a subject, or just some colours you want to retain.
Time for some finishing flourishes. Merge your layers into one layer on top of the stack (Cmd/Ctrl+Alt/Opt+Shift+E) and hit Cmd/Ctrl+U to bring up the Hue/Saturation panel. Increase Saturation by 20 and change Hue by 5 either side to make colours pop.