(smile#gb) green + blue · (smile#rrg) 2 red 1 green · (smile#b+++) light blue · (smile#800080) hex
Bind a colour to every smiley you send with the global form, e.g. /or (all red). /o on its own clears it.

Letters and +/- need the Colors / Light powers; a hex colour needs the relevant colour power. Put the code where you would type the smiley.