Almost nothing here - and what does exist tends to be simply flood lights at the base pointed up or temporary (i.e. rainbow flag on Confederation Building for Pride Week, elaborate Christmas displays on downtown bars, etc.).
Confederation Building (provincial Legislature) during Pride Week:
Colonial Building (former Parliament, currently being restored into a museum of our political history from 1583-1949; but on hold-ish due to our economy; anyhow, example of the flood lights thing).
Oh, and one other. Pics are from when it was still U/C, but the St. John's Convention Centre does the rainbow thing at nights if there's anything on the go. Unlike Confederation Building above, the colours are always moving.