You see a fair bit of stamped/stencilled concrete driveways where he have a holiday house in the U.S.
To be honest - I think it looks cheap and inferior and sticks out like a sore thumb. I'd rather leave it until I could afford proper slabs or block, but if I had to choose one option, it would be stamped.
Some people up our street had this done to their drive about 8 years ago. About 6 months after it was done they had to do some work to the water main which meant digging up part of their recently laid drive. It was then repaired with tarmac. So, 8 years later it still has a tarmac'd area. It looks awful. Are you sure that is your only option?