Glowing, Possibly Radioactive?

Abstract Thursday again, my favourite play day   Card class and an abstract blip, what more could a girl want ( I use the term girl, loosely )
This is the picture on the front of another one of T's jigsaws.  They are mini chocolate eggs, given a neon glow in LunaPic.  They look to me like radioactive coals, perhaps the propulsion system of a Steampunk train.

Thank you to Ingeborg for setting this challenge and giving us free rein to indulge our imaginations.