I've tried to reproduce the "curved" menu feature in the standard BOLD menue interface to no avail.
Now, I know you can change the background color / text, but this then makes the area "squared" rather than curved. I've located the image it uses and have re-created it, but it just multiplies the background rather than uses that image as a singular bg.
You have to click the thing on the right of the image and then there is a setting in there that you can change the up/down,right/left and when you change those it will show the image correctly. Just gotta play with it