dunan is a little program that shows animated Miku Miku Dance 3D models on the desktop. It also supports Miku Miku Dance motion files and has a built-in settings menu and mouse and keyboard control functions. It can optionally play MP3 or Ogg files. It uses real transparency, and can be used with any window manager. It has very few dependencies, and works fine with compiz.
typhon is a slim and themeable OpenGL-based frontend, dashboard, and program launcher. It's meant to be easily used on Linux HTPCs, but also works on standard desktops or as netbook launcher. It has picture support for background, icons, stencils, and preview pictures. There's also an optional auto-screenshot mode that creates a preview picture of the launched app after a user-configured time. It also has a built-in OpenGL ffmpeg video player, which can be used to video preview programs and emulators/ROMs or simply to watch some movies. The video and everything else can be rotated into any direction and the position can be saved. Everything can be configured by the user, including colors, whole color themes, font, font size (any TTF font will do), optional sound effects, optional 3d icons (using glut), and background and preview pictures. Already installed screensavers can also be used as backgrounds using compositing and transparency.