r - When plotting heatmap using ggplot2, how can I gave NA data a shape -

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i using ggplot2 generate heatmap this

http://i61.tinypic.com/1zf321e.png

i use code 

ggplot(meltdata, aes(variable, ids)) +  theme(axis.ticks = element_blank())+   scale_y_discrete(expand = c(0, 0))    + scale_x_discrete(labels=null,expand = c(0, 0))    + labs(x = "",y = "")    + geom_tile(aes(fill = value),colour = "white")    + scale_fill_gradient2(na.value ="black",midpoint = -log(0.05,10),   +high = "red", low = "steelblue",guide="colourbar")

so far plot this

http://i61.tinypic.com/2nitgm1.jpg

my question is there anyway can change na data points (which black in plot) shape of cross in first plot. less important question can make color more rainbowish first plot instead blue , red?


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