When our facility wants to show us appreciation, they usually order us pizza. They also, from time to time, order and hand out pens (I swear, 99 percent of aides and nurses go nuts for a good pen, haha).
A place I used to work bought gifts on CNA appreciation day - small things like candles, slippers, office supplies, candy, little inexpensive gift sets. A variety of things, but they got enough for everyone and put them on a long table in the break room, along with some punch and cookies. Everyone was given a token, and on our break we could trade our tokens for one of the gifts, and enjoy a snack. It was fun, though I remember the last person to get to the gift table was a guy and he got to choose between a set of sparkly lip balms and a pair of fuzzy pink slippers, lol...so I guess if you do something like this, make sure you have enough male-appropriate gifts for your facility.
Our facility also recently started a "bucket board". The idea is that drops of water fill a bucket. They compared the bucket to morale, and the idea is to fill each others' "morale" buckets with drops of "appreciation". So, if a coworker helps you out, or you see someone working extra hard, or just doing a great job, you write them a little note on a water drop and pin it to the board. It sounds silly, but it really does brighten your day a bit when you walk by the board and see someone recognizing you for something good.