Create a vector rectangle and colour it using layer styles. Please note that the select modify and feather options will only work in the same way if you are using the same settings for the size of the rectangle, canvas size and dpi settings. You can still use the same method but you will need to change the number of pixels to a higher or lower amount dependant on your settings.
A really quick and easy effect. Good for use when trying to add text to a scary photo. Could also be created with a white background with light grey and blue colours to create an icy effect.
A great easy to follow tutorial. First use the liquify filter ( filter > liquify) to stretch areas on the face, particularly arching the eye brows. A good tip is to try to make the face unsymetrical. After adding a layer of texture and aligning it with the photograph below, choose hard light from the layers panel drop down menu with the texture layer selected. Erase the unwanted areas and use the dodge and burn tools to highlight specific areas. A good tutorial for changing the eye colour can be found here: Zombie eye.
This video covers in a lot of detail the best ways to change the colour and tone of imagery. Desaturate with different areas of colour highlighted, by going to: Image > Adjustments > Channel Mixer. To change a photograph to Sepia tones: First Desaturate the image (Image > Adjustments > Desaturate) and then use the photo filter: Image > Adjustments > Photo Filter.
Desaturate images and use levels and layer styles to turn items into gold. This is quite a long tutorial but the effect is shown in the first few minutes, before going into greater detail on other items.