I could spend most of the day just sifting through dockapps.org. I’ll admit that a lot of them look a bit outdated, but some of them are quite smooth. I mentioned two a lo-o-ong time ago that are still very attractive — wmhdplop and wmforkplop.
Both of those are available in AUR and in the Ubuntu repos, but you’re not restricted to what you see there. One nice thing about (most all of) the dockapps is that they require very little to build. And of course, if you’re using Arch, a good number of them have corresponding PKGBUILDs ready and waiting.
Just don’t go overboard with them. ;)