In general: You can divide "bodybuilding" routines into roughly 2 categories (I suppose) for the purpose of this discussion:
-Power-building, which focuses on increasing strength over any other factor... Many different routines here, from Hoornstra to Coleman to Yates and so on... The guy in the 600lb raw bench thread was doing this as well, though with quite a lot of extra volume in the form of drop sets after his heavy work each exercise...
Large differences in volume possible, some go very low rep on main movements, others stick with medium reps for strength work).
These would not necessarily be good as a "break" from powerlifting though, some of them basically look like a Westside ME + bbing split. Usually one has to take time off or deload every now and again... Coan and Kazmaier routines also roughly fall into this category...
Those that have you do low rep work on the main lifts (and then whatever) make perfectly fine PL routines as long as you're not restricted to one of the lower weight classes for whatever reason and you don't mind eating a good amount.
They ought to work fine for drug-free guys as long as you know your limits, and you can find many of the top drug free BBing pros (the strong ones, anyway) do them for example.
If you see a very strong bodybuilder, that's what they're likely doing.
-"pure" bodybuilding? I can't think of a proper name here... Basically those would have very little impact on your maxes unless you do them for years... I guess this is what most people think when they hear "bodybuilding"... Lots of misc. lifts that are difficult to progress on... Only higher rep stuff, not much focus on strength progression... You don't see this being done successfully as a complete routine by drug free guys past the beginner stage usually... It's heavily reliant on "help" to provide gains... Does not create strong people, usually.
I guess it's what you get when you take what some guys do for assistance work (i.e. 5 sets of 10, same light weight for all sets) and make an entire routine out of just that stuff.
That would certainly provide a break for the joints and tendons though...