every now and then i find myself stuck idealess. generally at this point would just go take a nap,instead what i have begun to do is study an artist. the idea,flip though some books and find something that catches your eye. in a way it has helped me develop. it is a good way to help you find you niche. study what you find interesting,attempt to replicate it,make it your own.
since everything at this point has already been done,you might as well add your own twist to it.