If you want to load a Vodaphone theme on your Blackberry 7230 ( that's the one that I test mine on) click on the link below. I already modified the ALX file to load on my T-Mobile 7230. Aside from having the default Blackberry one, now I have the Vodaphone one
Try it out and let me know if anyone has found the O2 theme for 7230/7290. They have a one for this type of phone that's just quality (the cool blue theme for the 7100 but for the Blackberry 7230/7290) I have yet to fetch this one.
http://www.columbia.edu/~cp2195/7230Themes.zip