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    $\begingroup$ Using inset also makes it possible to locate the cross anywhere: a = 0.2; t = 6; Graphics[{Circle[], Inset[Graphics[{AbsoluteThickness[t], Line[{{-a, -a}, {a, a}}]}], {1, 0}, Center, 2 a], Inset[Graphics[{AbsoluteThickness[t], Line[{{-a, a}, {a, -a}}]}], {1, 0}, Center, 2 a]}, Frame -> True, ImageSize -> 250] shifts the cross to the right. $\endgroup$ Commented Feb 5, 2013 at 15:42
  • $\begingroup$ Just out of interest: why does the cross stay symmetrically if I combine it with a plot with differently scaled axes? Doesn't the a refer to the values of the x and y values where the lines of the cross end? $\endgroup$ Commented Feb 5, 2013 at 16:00
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    $\begingroup$ @Apatura - You could add aspect ratios to the insets, or scale them as shown in the addendum to my post. $\endgroup$ Commented Feb 5, 2013 at 18:28
  • $\begingroup$ Interestingly, the green cross is not offset on Mac OSX. $\endgroup$ Commented Feb 5, 2013 at 18:30
  • $\begingroup$ Thank you very much, your answer definitely helped me understanding the use of the Graphics and Inset options. $\endgroup$ Commented Feb 5, 2013 at 22:05