I often add Lens Flare to my renders during postwork. I hate Photoshop's defaults though.
I use Photoshop 7 with Kai's Power Tools 6 plugin to do mine.
The KPT 6 lensflare allows me to do anything I need. Great choice of lens focal length. Infinitely scaleable in size and light intensity. Any colour. No halo, no rays. Full halo, my choice on number and rotation of rays.... anything.
And as a bonus KPT 6 includes Kai's Goo which I use a LOT for things like bending candle flames. (With lens flares brghtening them up.)

NUDITY WARNING: This image uses three lensflares, One with red halo and rays on the staff tip and two white point lights on the Dragonthorns fingers. (And the candles have been Goo'ed.)

www.renderosity.com/mod/gallery/index.php

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