First, where are you getting laser engraving done?
Second ideas
-you could do roses intertwining down the fretboard and onto the headstock where you can have two flowers
-just do thorns going down the fretboard
-the ever redundant winged inlays
-dots (a little boring)
-finger prints
-trees
-tigers
-wolves
-any other cool animal
-your signature
when you can inlay anything you want pick something special to you, a favorite plant or animal, a loved ones name, anything that you feel is special. Look around your house and belongings and some ideas may come to you.