The default theme on my installation is something which maps the values to pink and cyan. How to change it for example to a gray scale theme?
You can use
library(lattice)
lattice.options(default.theme = standard.theme(color = FALSE))
which turns on black-and-white suitable for printing. I've also played with things like
sb <- trellis.par.get("strip.background")
sb[["col"]][1] <- "lightgray"
trellis.par.set("strip.background", sb)
which changes just the header background.
And I thought people only asked ggplot2 questions here :) Nice to see some lattice for a change.