More Molds by Tony Roberts.
The effects of the envelopes may be seen as applied to the checkered square shape.
Click Here to download the file (43K). Tony advises keeping the files separate and creating a clip art folder in the ClipArt Gallery so you can access the molds as needed.
Envelope shapes, when applied to a selected object, Mould the object’s (or group of objects’) shape to that of the envelope shape.
UnZip the file to a new folder. Open the Clipart Gallery and select Disc Clipart... Press the Browse button to the folder you just created. Press Add.
Xara will prompt you to Create a Clip Art Index. Press Create. (Xara will now create thumbnail images of all the envelope shapes).
Here is a brief tutorial for using these envelope shapes.