Shoutbox

I know how to do it but is there a way to make them big and not tiny?

you need to get stuffplug ng, eneble oversized emoticons and then you can add big ones

http://www.stuffplug.com/

stuffplug is a plug-in for messenger plus!

You can with the plugin "stuff plug ng" from http://www.stuffplug.com/
To configure the plugin just go to plus > preferences > plugins > click on Stuff plug ng > and then click configure

Edit: (Damn, Supersonicdarky beat me )