Creating a glowing, animated abstract shape

Hi everyone,

I need to look into creating a kind of abstract glowing effect. It is used a lot in templates on Template Monster.com such as these:
http://www.templatemonster.com/flash-templates/22700.html
http://www.templatemonster.com/website-templates/22697.html

I’m very experienced with flash, but not in this kind of way, more with application type stuff.

Can it be done in flash with some of the glow filters?
Or is this probably being created in something like After Effects or Motion and then being pulled in as JPEG Stills?

I’ve looked through some tutorial sites, but most of the animation tutorials are pretty basic… and I’m not sure what to really call the effect…making searching for tutorials or forum posts a bit tricky

any help, tips, or ideas would be appreciated