Why not let us custom create frames?
Give it a 48x48px picture that becomes all the edges.
It doesnt scale the image. It cuts the edge 16x16 and put it on the top, then cut from 16,0 another 16x16 peice the stretches the top part. You get the point…
This can be done through 8 different images, but to have a simple “FrameImage” property would make it alot smoother.