How about the girls from Galaxy Angel?
As a loyal GA fan, I may be biased but.... I'm almost sure that it's hard to PS any indecent or close to indecent pictures of them... Mostly because that the anime was fit for kids... or pre-teens as far as I noticed. The only indecent thing for them as far as I know ... as previously mentioned, was the dating sim.
There was only a few CGs with
any glimpse of space in the game, and in the anime, a few more scenarios were based in space but I don't think any of them are useful.
However, GA II may have been intended for a more mature audience. I've seen more questionable act and innuendos in the first couple of episodes than the 4 seasons and 3 games for the original
combined.
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One where you either sleep with several girls after a minimum of conversation because you lie about your job and how much money you make, or you stay friends with a girl for years because you've decided to actually be a sensitive guy who listens and then *watch* as other guys come in and sleep with the girl after a minimum of conversation because they (probably) lie about their job and how much money they make?
*Chuckles* I support your idea!
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Now, back to the topic.
This may not be much of a suggestion, but try animes that are PG or 14+? (And of course, hentai) They may have a few borderline graphics to start with, and chances are some people have already crossed the borderline and created a few 18+ pictures of them.