Here is every thing you need to create dynamic themes from the 3.60 SDK
Read RAF-Specifications_e.pdf for creating raf files and if you want to create your own scripts PSJS_Language-Specifications_e.pdf
I made a short guide on making video image sequences in to themes. you can do the same to your own image animations made in photoshop just like i done with the I love my music theme.
and you can read Glowballs threads for ideas on making themes.