Salam Alikum
Dears, the floral designs sound obsolete now, the people have been copying such illustration everywhere, here is some smooth lines and curves I used to do some of my best UIs and designs, it has different sets of different line to curve deformation so you can pick whatever to makeup your design, although some of those curves are easy enough to be done on vector programs like illustrator or xara even in photoshop, but It will be more easier for some guys to just copy, past and adjust size to get what just in your mind, attached below some samples of using the free vector sets:
Samples
The package contains ai, xar, png files.
Click here to download
enjoy!