This is brilliant.
I am surprised it hasn't been done before, given the obvious pun and all the Dalek related art out there. It is the sort of thing I wish I had thought up, though I lack the skills to eggsecute (see, I just can't help myself now) this. Go check out the step by step pictures (and the artist's other egg designs, all are brilliant).
Also, I never thought the Daleks and R2-D2 to be physically similar, but something about the egg rendering makes the differences less meaningful. Of course, the differences in their bottom halves would be impossible to convey in an ovoid form, not to mention that one is good and the other(s) are evil.