Does anyone know of a more robust piece of software than

Video Fun Box (www.jellypie.co.uk)

I know there are ready made solutions like Digital Juice, Artbeats, Etc... but I would like the chance to create my own stuff

Any words of advice, experiences, etc...

Thanks in advance. 

In the past I've made my own loops with AE and Photoshop.  It's not usually something you'd want to do while you're busy, though!  When you say "more robust", what's wrong with that software?  Does it interfere with Avid?

Avid FX/Boris Red/Blue has the ability to create motion backgrounds using the generator templates.  I like the scales with a little blur, and then i just make them so they loop.  I'm pretty sure there's a tutorial on BorisFX.com