I'm not aware of any such thing. I end up doing that a lot myself (server hopping). I think that's the reason I like Blockland so much. It provides a huge range of exploration opportunities. If you don't like one server, try out another one. Repeat until bored, or satisfied. I don't start up my own sever though, because I'm here more for the looking than the building. I don't know why, but I like to look a lot more than I like to build... However, map making is a slight exception to that. When I'm working on my islands, I have to hold back because I keep thinking "Oh! That would be awesome to build a bridge here!" or "I think it would be great to have a platform here, with a walkway to that room over there." But, I don't put those things in, because I want to leave the map more open for others to do those things. If I fill in every cool thing with my own ideas, it may be really neat. However, it won't be a great map because it won't provide anyone with the ability to free build to their heart's content, because most of the good ideas would already be taken.
I do agree though. It's really nice to see when a really nice build server is up. I just love to look around, and see what secrets I can discover... So far, I've like everyone of your builds that I've seen on other's servers. Nice job! Anyway, yah, I'm here for looking, usually...
Mouser X over and out.