bloom effect withouth shaders

Hello i was wondering how can i create a bloom/glow effect over a image withouth using shaders .
I made a little code that generate pixel trails , i need that my trail can have bloom/glow effect but i cannot use shaders because i need that the program can run on 13 inch macbooks.

Any idea how to achieve this effect?

I would like to have something similar to this:

http://www.youtube.com/watch?v=n7sjAO-F1sU

thanks

Adam