Hmm, I have yet to have a "play" with tcvd so I don't know for sure what is required, but I seriously doubt that VBox (which I use a lot for my testing) is of any use WRT image creation (since IIRC it defaults to create disk images in the VDI format).
A better tool would be qemu-img which should be part of any qemu extension, but even that is not required since I believe that only the "raw" disk format is supported for tcvd (and none of the vmdk, vdi, vhd, qcow, etc. "flavours").
Such an image file can be created simply with
dd if=/dev/zero count=1 bs=50M of=disk.img
(choose your block size value and disk image file name accordingly). This is now your virtual hard disk, un-partitioned and without any file system.
I somehow believe to have read that tcvd operates on un-partitioned image files (but again due to not having tried it myself that might not be true). On that assumption you should be able to create a file system (e.g. EXT2) with something along the lines of:
losetup /dev/loop99 disk.img
mkfs.ext2 /dev/loop99
losetup -d /dev/loop99
(choose a free loop device accordingly). It might even work with just mkfs.ext2 disk.img, but a minor variation of the former method has worked for me for partitioned virtual disk images in the past.
I trust you will keep us updated with your findings.
Edit: I changed the file system type in the sample commands from EXT3 to EXT2 since I have the impression that this is the (hard-coded) option that is currently supported.
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