I discovered a Japanese blogger who makes custom PSP themes. Not only that, but she makes a lot of otome game themes once along with anime/vocaloid etc. ε(*´▽｀*)з She does not take requests so please don’t spam her asking for any, it’s just something she does for fun. If you like any of her themes I recommend just pressing the clap button letting her know that you enjoyed whatever theme you downloaded.
I figured I’d share this link since I know I always like custom otome game themes and they’re few & far between.