Particles without using images

I’m currently attempting to write a game without using any pre-generated image files.  When an enemy is blown-up I would like a small particle explosion of just some basic coloured pixels.  Is it possible in ParticleCandy to just use either single pixels, or 2x2 pixel blocks as the particles or do I have to use image files for them?

I’ve scanned all of the documentation and everything points to having to use image files.

Thanks in advance