Plotting both horizontal and vertical point ranges simultaneously in ggplot

Is geom_errorbarh what you are looking for?

ggplot(data = df, aes(x = x, y = y)) +  
  geom_pointrange(aes(ymin = y - y.range, ymax = y + y.range)) +
  geom_errorbarh(aes(xmax = x + x.range, xmin = x - x.range, height = 0))