I had this cool looking Soviet Russian transistor radio Neywa 402 (made in 70s) on my shelf for a year. It was nice to look at and had a sentimental value but it didn't work. So I decided to give it a new life as a vintage bluetooth audio speaker.
A radio - You can make almost any radio to work with bluetooth but I think smaller is better.
A bluetooth speaker - I bought mine from ebay, they cost about 10 USD with shipping.