Lee,
What i tend to do if i am after stuff like you have requested is look on the Microsoft Clipart Website in the first instance. Quite alot on there is quite cartoony but sometimes there is something that you may find useful.
Obviously, you can only access the downloaded files if you have the Microsoft Office suite but if you do have it, you will find that most of the clipart on the website can be welded or converted quite easily to be cut.
Just download which one you think may work and just cut&paste into your Signmaking Software – works for me.
http://office.microsoft.com/clipart/def … x?lc=en-gb
Cheers