Wallpapers are easily done by placing the pictire in the photo's folder and setting it as the wallpaper. No flash used at all.
Themes are different. They overwrite the Sony original flash to make the XMB look different (but you'll probably know that)
You can do it by flash but you can use a program called CXMB, and it can be used on 3.52 M33.
It runs from the memory stick so it requires no flash remaking.
I'm attaching it.
All you need to do is put it in SEPLUGINS in the memory stick root, make a text file in SEPLUGINS called "vsh" and put this in.
ms0:/cxmb/cxmb.prx
Then, get the theme you want and overwrite the files in font/vsh or whatever is needed.
Then enable it in recovery. Sorted!
It should work - If not you'll have to get more help on this. I'm not an expert.
I hope I helped.
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