Lately I been playing Soraka often. I own 3 of her skins, Reaper, Program and Celestine.
Celestine feels almost the same as the classic one tbh. And the other cheaper skins I don't have, imo are not super awesome that I didn't bother getting them.
Program Soraka has the most fun sounds and effects of them all, but always using the same is getting me bored.
For being such an old champion, I feel Soraka has very few fun skins... :(
I mean, look at Janna, look at Sona. Lulu, even Nami... they all have a good variation of colorful skins but Soraka doesn't. >.<