Samsung Galaxy S II :: How To Get Emoticons On Keyboard

I just bought a Samsung galaxy s2 and I am trying to figure out how to get emoticons on the keyboard. Before this phone I had an iphone 4 and I assumed that the galaxy worked in the same way as you just download an emoticon app from the app market and then they were on your keyboard. Tried that a few times in the Market but it didnt put the emoticons in the keyboard. Instead it was a completely different text messaging app all together. Would be nice if i could get them on the keyboard that comes with the galaxy instead of a completely different text messaging app. I saw the if you hold down the period button you get a few smilies but they are just the ones like this for example =) =P.