The coolest #scale21x booth award -- and most genius donation method -- goes to NUCC (National Upcycled Computing Collective).
They took this soda machine and transformed it into a massive server from reclaimed and refurbished server racks. They even wrote a whole thing to do the transactions.
You stick dollar bills in, select which "flavor" you want, and it spins up a VM for you to access all weekend long.
(You can check out their projects at https://www.nuccinc.org/)