u can also go on Google and type in free GUI elements you will find a lot , u can also clone the works of others in Photoshop, take down any images you may want, open Photoshop use that as reference and repaint it basically recreate it on another layer using it as a sketch draft worked well for me so far ... since no 1 complained ...yet...
but u can also try open game art, and the forum "search for free graphics " allot of people artists from our community gives free stuff , GUI is the basic elements u don't really need to worry , i wold worry more about the game graphics then the Menu button , or the Play button 
Tayyab26 Hope it helps u and diden't offended wasn't meant to be harsh