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 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.
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.
Use Layer Styles to create neon text by selecting the layer, choosing blending options then stroke before changing the fill option within the stroke panel to gradient and shape burst.
This video shows two different ways to put a double outline around an object. The video shows the process used on text but this process can be used on any object / layer. The two methods both use layer styles, the first is using a stroke and an outer glow, the second uses a stroke and then a layer below with a larger stroke to create the double outline.
By creating a cut out of an object that is to project the shadow, you can duplicate the layer and use the transform > distort effect to create the right perspective for the shadow before moving the layer behind the original object and darkening and reducing the opacity of the layer.
This tutorial shows you the many effects that you can achieve when using layer styles. You don’t have to stick to using layer styles on text; double clicking on any layer in the layers pallette will open the layer effects options.