Your Office
We spend a lot of time in our offices, so spend a little money on it and on yourself:
If you’re not happy with your office chair, and your firm won’t spend money on getting you a new one, treat yourself to one that provides back support.
You may want to consider investing in a standing desk.
Get your own coffee station. I have one. Sometimes you just want the coffee you want with the add ons you want.
Put up the diplomas, the awards, the family photos.
Consider something extra (first get office approval). Perhaps a mini bar, a record player, a stand up video console - something to turn your office into a place where folks feel comfortable to congregate and get together.