If I can find something from the original set which matches those, I'll see what I can do.
It's quite a bit of work to add new smilies though as the containers have to be resized (forum and chat, both toolbars) and each browser handles it slightly differently so it's annoying and fiddly.
The smilies also have to be reorganised, which is a laborious process and involves deleting them first and then adding them back in reverse order.