I remember Roger Bisby writing in a trade magazine that he runs up behind pedestals in 10mm plastic, as it's easy to hide behind the pedestal, and flexible enough to run straight up to the taps. I thought it wasn't a bad idea to be honest, though I've not ever done it myself.
I haven't had to run pipes up from the base of a pedestal for a long time, (a couple of years) as quite often in new bathrooms, I'm chasing my pipework in, or running it in the new stud work, or just fitting floating, vanity or other types of basins.