I think what you are referring to are the .gifs a lot of us use here on the boards, unfortunately they don't work the same in e-mails, but you can look at the directions for putting these in posts here, its easy and feel free to use any you find in the Cruisemates gallery. If you need any assistance, just give a yell, many here can and will give you a hand.
So, do you have a cruise booked? If not, I'd also suggest you more on that too, life is too short, get out there!
Here is the :message boards tricks link: