@Xabbess did some post-laser experimenting with embossing powders : Still hung up
Here is pre-laser embossing thread: Budget metal etching/marking/engraving
And it looks like @smcgathyfay used the laser to sinter the powder: Laser Darc Colors / Powder Coating - #20 by smcgathyfay
There was also mention of powder coat experiments in those threads: handverker: laser cured powder coat on acrylic
I think the key here is using something sticky to keep the powder in the right place, or using a laser you can turn of the head fan!