A solution may be to give Z-values to your contour to create a stack of contour plots, then rotate the plot until the image looks the way you want it to. For example:
IDL> a = BYTE(DIST(500))
IDL> c = contour(a, ZVALUE=2)
IDL> d = contour(a, ZVALUE=1, /overplot, color='blue')
IDL> e = contour(a, ZVALUE=1.5, /overplot, color='red')
This will create a stack of contour plots that you can rotate. I hope this helps.
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