re: Playing with colour in Opportunity Crater.
On Sol 4 they took a few pictures of the lander using the L4, L5, and L6 filters.
Opportunity - sol 4 - pancam
You might want to try these techniques on them and see if the American flag and NASA logo colors come out about right. I realize the Martian atmosphere might change the colors a little, but would still be interesting to see what they look like. Also, could see if the electronics box and other lander parts come out the correct color.