Lexus commissioned a fully functional electric car built from laser cut cardboard. It comprises 1700 individual pieces and took 3 months, I imagine the builders were quite card-bored by the end of assembly.
LesMarco kindly shared this file for a sugar skull pen holder through the thingiverse website. It's a good example of slicing a shape and decorating it appropriately. Being cut from Poplar plywood the details could be coloured in nicely with some fine tips pens to add a real flourish of colour. A handy pot lot this is a good way to despens stationary as required.
Diego from engravers dungeon has developed an incredible technique for laser cutting that really makes their designs stand out. The colours are painted on before engraving but the secret sauce lies in the two tone style of engraving, something that they are understandably keen not to share. The whole thing is finished off with a mixture of wax and varnish to make a nice piece that I would be happy to own. I make no bones about it, this is some high class engraving even if I am trying to be humerus.
Instructables user JackCarter made this awesome lasercut tank model from MDF. The functional tracks looks great and the laser is perfect for making a repetitive object like that, although they do also provide the files to make a static track if you don't have enough patience for assembly. There are lots of tank models out there but, because this comes with instructions, it is definitely a challenger for the best.