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.
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.
The nice cuts team ran a mini workshop where they made these faux stained glass windows, laser cut from MDF. The idea is pretty simple but very effective, I imagine they would be a lot of fun to run for a group of kids. Clearly, you'd be shattered after running a workshop for the whole day but they totally smashed it.
This laser cut ball mask from instructables user woz.artur would make a great costume for any Halloween event. The mask is cut from black acrylic and engraved with the maze detailing. The mask was heated and shaped to match the contours of a face and then the lines were filled with gold paint. The handformed nature to convert this from a flat sheet means you won't be going in to mask production but it would be a spectacular one off