Continuing with the idea from my other post about Nodes...

Here is an easy and useful usage of glare nodes in Blender.

In the two images below, you can see that one of them is a normal rendering, while the other one has a glare applied to it. (This glare is NOT set-up in the 3D View editor in Blender, it is an AFTER EFFECT that is applied using the Composite Nodes function.) Because of this, there is no additional rendering necessary. It could be applied/activated before or after rendering! [It can help to see what this effect is doing by opening the first image and then using the Next and Prev buttons to jump back and forth between the first two images...seeing without glare and with glare, alternating.]

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Click image for larger version. 

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Below is an exaggerated version to make sure that you can see basically what this (Glare) node is doing...

Click image for larger version. 

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This effect is very easy to use, has many options (including different types of glare), and adds a lot in images where Glare is needed/desired.

Below is a screen-capture from within Blender's Composite Node editor showing that there is really nothing to setting this up.

Click image for larger version. 

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Peace

James