The party is this evening, so after a month of doing nothing, I've had a mad rush this afternoon trying to finish it off.
The hat is the back part of a cap I bought from the Build a Bear Workshop - the original plan was for the chimp to wear the cap, but it was far too large, so this presented itself as a solution (I still have the front half of the cap, along with a mini tshit, both of which say "Party Animal", which I'm going to use for some future project.)
The diffuser, which works fine IRL despite looking rubbish on camera, is make using a folded postit note.
The only thing I still need to do is decorate the hat in some way, which I'll probably do using a school's enamel pin (I'm friends with someone that works for a school supplier)...
...as soon as I get it from her this evening.
Finally, you'll notice an elephant and hippo decorated with acrylic paint - alas these are not technical in any way (I was going to put some LEDs on them, but couldn't figure out how), they're just silly and fun.
The chimp award is for Community Spirit (which is what the message across the display says), and the other two will be given to the people who have posted the most, and have created the most popular thread.