well, i would love to hear some great responses to that question aswell. I think its a problem that plague's all turtle owners until they find a solution that suits them. As of now, i have a pile of rocks, with a big rock on top. On each side there are two 'ramp' rocks leading up to it, so my painted can walk up and not have to climb. I also have some corkbark floating around, that he loves to just rest on (although he's too big for it now, it sinks as soon as he gets on it).
Alot of people use bricks, maybe you could use bricks to get the right height, and then but something on top of that that wouldn't be as difficult to climb. Some people use plexiglass, and i don't really know anything about that. I wondered about making something myself, but i wouldn't know what glue (or plexiglass) would be safe to be used in an aquarium. Another option is driftwood, but be very careful to sterilize it. I would probably boil it then dry it out, i think most people bake it though. I hear it grunges up the water though, and that stuff starts to grow on it (probably a sign of a healthy ecosystem though).
Anyways, those are the most popular ideas. It's not very easy to come up with something that works for everyone though, so i suggest a carefully stacked pile of rocks!
K!LOS
p.s: I'm second to post!!!