They can be any VLANs you wish to use; even the same VLAN, if you're in a lab where there are no other options.
Although I would caution against using L2 mode for the 1000v and instead encourage L3 mode. This does away with all that VLAN nonsense. There's also a rather straight forward setup guide in this Cisco community document.
VCDX #104 (DCV, NV) ஃ WahlNetwork.com ஃ @ChrisWahl ஃ Author, Networking for VMware Administrators