Flower Power

For this look you need to start with a photo that doesn't involve skin tones. 
1.  Open the photo in PSE as a RAW image.  Move the Vibrancy lever all of the way to the right.  If you had a photo with skin tones it would look awful at this point but with a flower it just makes the colors a bit unreal.
2.  Choose Open Image in the bottom right of the window and the image will open in the regular PSE screen.  Choose a texture to lay over the design and move the transparency down to 25%.
3.  Add a New Adjustment Layer from the Layer menu in Gradient Map.  Choose the Black and White option and reduce it to 60% or so.

Finished!