When you add a vexel (or go to Manage Vexels) you will get the code to add a thumbnail to your website or forum so you can easily share your vexels :)
It has HTML (regular websites), BBCode 1 (most forums) and BBCode 2 (VB forums I believe).
Thats an awesome idea :D It saves me having to upload multiple vexels to random spots on my server in order to link them on forums and stuff :D (various areas don't like hotlinking *pokes it*)