Попробуйте это:
var image = [[CPImage alloc]
initWithContentsOfFile:"Resources/myimage.gif"
size:CGSizeMake(20, 20)];
var imageView = [[CPImageView alloc] initWithFrame:CGRectMake(0,0,500,500)];
[imageView setBackgroundColor:[CPColor colorWithPatternImage:image]];