Just a place for me to list possible ideas. Any thoughts on these or any ideas you have, please comment. 

• Currently using sprite_alt, to indicate a toggle switch, setting alt_state, might want to know state without setting an image (maybe alter to use no image rather than an empty sprite).
• Health Bars - not sure i want to go to far into drawing, but used a lot in game gui's. Maybe do a nine slice type function?
• Draggable windows. Set a bar at the top of gui look for mouse over, button held and drag?
• Message board window. Show messages, than can be dismissed.  Allow scrolling (slider down rightside)?
• Set window sizes by percentage - is that useful? maybe need to set min/maxs.
• Minimap - i do have a test game with this in somewhere, maybe move over?