This is awesome, just a shame there isn't anything like this for MS PowerShell.
function color ($name) { $Host.UI.RawUI.ForegroundColor = $name }
function sayhello { 'pardon me do you have any grey poupon?' }
echo $(color yellow) $(sayhello)
PoshConsole made a nice stab at it. Sadly it is no longer developed, I think.
Simple unicode characters (the smilies etc as used in OP) does work in powershell ISE.