best filter/technique for adding lense flares/glows, sun warmth in photoshop?

Hi all,

Just wondering is there a special filter software out there that specialises in lens flares when trying to add them into photos via Photoshop?

Or a special technique that is used?

Eg these have all been digitally added in

Obviously there is the lens flare filter in photoshop, but I find it doesn't give me the results I am after usually, either that or I don't know how to use it properly!

Any help would be great