I had cause to walk through Bristol centre the other evening (going to see Orbital play) and was shocked at how bad the cycle lanes are there. There's a big pedestrianised area with cycle lanes going through it, but the lanes just have a slightly different paving and the occasional bicycle symbol. As a pedestrian (I'd usually be a cyclist), it was tough to figure out where the bike lanes were and unless you deliberately looked for them, you wouldn't know. That's definitely one area where different colours are required. Not even paint.

To make it worse, there's lots of places where pedestrians and cyclists would inevitably cross paths to get to the traffic lights and of course there's no indication of where people should cross the cycle lanes.

Unfortunately, Google streetview is too old for me to provide an illustration of how bad it is.