Here is one that’s a bit exotic, if for no other reason than I can not find a US distributor. So ordering direct may be your only option. I have no idea what shipping from Japan would be, but this $40 porcelain vase would be very cool on most any bookshelf.
After translating the page, you can see that it’s called the Hana Paperback planter. It’s about the size of a trade paperback. What’s really nifty is the slipcase it comes in, so when you have no flower to show you can flip it around so the spine is facing out. This would be a very unique gift for any book lover.