Hi i'm new modeling on maya and i been looking for this around the web and couldn't find a tutorial about it, how can i do this kind of surface on a polygon model?

http://someimage.com/UW6Mcug...

Hi daverave how do i keep the borders smooth like without getting inside, smooth like this image
http://m4.uxcell.com/i/12c/ux_a12071100ux0362_ux_c.jpg

or this one...