This will place circles on your chart for the opening daily price. If price is above, the circles are green. If price is below, the circles are red. I wanted to be able to see the opening price a bit easier while in smaller time frames.
// Written by Robert N. 030615
// Still looking for way to remove from previous days
study("Open Daily Line", overlay=true)
odl = input(true, title="Open Daily Line")
dopen = security(tickerid, 'D', open)
dcolor = close < dopen ? red : green
plot(odl and dopen ? dopen :na , title="Daily",style=circles, color=dcolor, linewidth=3)