Hi Daryl,
If you're looking to increase the height of the textbox when creating a note, I don't think there's a supported way to achieve that.
A similar question was asked here.
Admin QuikView Solution for CRM 2013
It seems able to change in CRM 2011, not sure if it works in CRM 2013, you can refer and have a try:
http://community.dynamics.com/crm/f/117/t/113389.aspx