Oh well. Thanks for trying on the thumbnails, guys. I'll see what comes up since I want them to match the ones I have.
I think it should be possible to take the border surrounding your current thumbnails using photoshop or gimp (photoshop preferably, gimp's so ridiculous stupid to use) and from there, resize whichever idol you want to the current size of your thumbnails, and copy paste the deslected border onto the new picture. If, in about 2 and a half weeks' time, you haven't managed to find/make any, and you're still looking, I could be willing to try making one for you.
As for the new invite bonus...well not too interested in the passion series fortunately I guess, otherwise i'd be banging my head against the wall wondering just why i can't invite anybody. T_T