Like this?
These were my first attempts – on a broken piece of tile I found – and they turned out pretty well. @roger181078’s Playing with the laser thread is where we discussed and started messing with the Norton white tile method and this is the video instruction we followed…
If you want to see some really stunning examples of this method, search for all of @bulldog’s work over on the Lightburn forum… it’s all done with a 2.5W Eleksmaker laser and he’s generously shared his “recipes” with each example…
I’ve intended , ever since the pandemic thing started, to get to HD or Lowes and get a box of tiles – I’ve got all the other materials – but just haven’t done it. I’m still reluctant to get out by myself… sadly, inexplicably, I get confused and anxious out there, trying to remember all the “socially correct” things I’m supposed to be doing these days; i.e. I don’t know how to “behave” 
– David