I just made a possible flower girl dress out of scraps in my basement. In half an hour!
It's not finished; I haven't done any detailing on it yet, and I'm going to hold off on that until I can actually try it on our flower girl. This SHOULD fit her; it's a pretty generic pillowcase dress, and they're adjustable (to a point), so unless she's WAY larger than most 2.5 year old kids, it's probably good. And considering I care for toddlers for a living, I think I'm a fairly good judge.
Also, keep in mind that a pillowcase dress pretty much ONLY looks good when it's being worn or is on a dress form. I tried to achieve the illusion by putting it on this huge stuffed bunny my aunt gave me one year. It didn't quite work.
And a couple close-ups, one of the ribbon/sash and one of the lace applique thingy (which has not been sewn on, it's just laying there).
All in all, I'm pleased with my half-hour effort. I don't know that this dress will actually work on the Boy's niece or not; the two layers of fabric (one blue, one sheer lace) are making it a little too stiff, and since the blue fabric was just taken from an endroll my mother got for next-to-nothing from her work, it isn't wide enough to flair out at the bottom like I'd like. But at least this way I can try it on the Sweetpea and see what needs to be done!
EDIT: The more I look at this, the more I realize how easy easy easy it would be to turn this from a pillowcase dress into a dress with a bodice and skirt; I think all I'd need to do is cut the dress off at the waist, make a wider skirt from the same fabric, and voila! But once again, going to make sure it fits before I start making it for real.