luizlizard has updated XMB Theme Cycler v0.3 which improves upon his earlier work by a significant amount. The new version adds a host of new features. In addition to automatically flashing an unlimited number of themes at startup, the program also has the following new additions:

Configuration menu
Dummy font flashing — Frees 2.5 mb in Flash0
Monthly theme cycling
Original theme backup
Scripting improvement over last release

There are some things to remember though, note that if you want to use both the autorun and the manual Cycle Theme functions, you’ll need to “set the 1.5 kernel to GAME since the boot folder has to be strictly at GAME, not GAME150.” Furthermore, he also warns people to keep the BOOT folder named as is, and to make sure that it’s located in the GAME folder, rather than the GAME150 or GAME340 folders. Lastly, XMB Theme Cycler is set to work for 3.30 and 3.40 OE firmware, so make sure you’re using that beforehand.