Put these numbers after 'lt' to generate the desired color:

0 gray/black
1 red
2 green
3 blue
4 purple
5 turquoise
6 yellow
7 black
8 orange
9 gray/black
10 red
11 green
continues to repeat...

Box fill (in pdf after epstopdf)
0 solid but shaded
1 sparse crosses
2 dense crosses
3 filled
4 left diagonal lines
5 right diagonal lines
6 left dense diagonal lines
7 right dense diagonal lines
repeats...