I got some treat balls at Petco or maybe Petsmart - they're purple and green and say Go Cat Go! on the side. It was a package of two for maybe $1.50. It's basically a hollow ball with a hole for treats.

Hey Eyorelop, I bought my slim cat treat ball on ebay (for around $6 plus $3 or so shipping). You should just type slim cat ball in the ebay search... there are lots on there.

I put pellets in as well as chunks of dried fruit. The holes are plenty big for both.

And shaking the treat bag is the siren call for bunnies! They can't resist.

The hole in it is adjustable, so you can make it as small or big as you want (up to the maximum). The pellets definitely fit through, in fact, I haven't really started using it but I've noticed it's a little hard to determine the perfect setting. Either the pellets (due to their elongated shape) have a hard time coming out, or they just pour out... I haven't played around with it that much though, so maybe it just takes a little time to work out exactly how it should be used... Or maybe it's just best suited for 'rounder' shaped treats, so it might work well with craisins lol

The hole on the 2 for $2 or whatever that Petco stocks is not adjustable. I looked at the adjustable one but for much cheaper I went with the others, it is a great size for raisins or pellets. Pellets come out easy though, so I usually stuff a little short stubby bits of hay in too, to make him have to work more to get pellets out.

Great fun!

I love the sound of Gracie grunting when she runs into the living room when I open the cage.
I love watching them eat on the 3rd floor while I'm sitting on the floor looking at their mouths go (and getting green all over them!)
I love when watching them binky and flop over.
I love that even though Gracie came from a bad home, I gave her a new start on life and she's just as happy as can be....even though she doesn't want to admit it
I love the looks we get, esp. Gracie with the black fur around her eyes. We'll start talking about her or something and she gives us this look or she'll tilt her head to one side like she understands us.
I love the little sigh/squeak Archie makes when he lays down and is relaxed.
There is so much more to the list but we'd be here forever haha! I just love every part of being a bunny slave

All of the above. I liked what Maya Consuela said about gaining the trust of a prey animal. And along those lines, people are always shocked by how much personality a bunny has.

To expand on everything that was said already, I love all these things, and I especially love watching my bunnies interact WITH EACH OTHER. It's like you have a private view of a beautiful relationship, with little to no verbal communication, but they simply adore each other. They look out for their mate, they share their food and space and toys. They snuggle. They have an entire house to run and play and lounge in, but they CHOOSE to be smushed together. We can all learn a thing or two from that.