Do you want it to be Animated? or a static image?
if you want an animated one..try using the trail effect listed in the forums.
static is possible if you use layers and layer masks set to additive or similar
Try to be more specific in what you want..Everything is possible..you just haven't figured out a way yet..Einstein said ..he would spend 95 % of the time working out the what the problem was before he worked on the answer...so what EXACTLY are you wanting..
When in doubt..or you are lost in a Zombie apocalypse or someone is giving you a hard time..Remember one thing..... Read the Construct 2 Manual..it will save your life.:)