I made a Master Chief pumpkin this year and posted a picture on Reddit. Happy Halo-ween!
I used the H2A Spartan Helmet stencil from here to do it:
https://www.halowaypoint.com/en-us/forums/f9237adeaf1742c09de144d7bf3f7507/topics/halloween-pumpkin-carving-stencils-resource/d9e066f5-eea3-4024-8d10-b9b0620da4c1/posts