I think I've got my #2 answer for Denver. I'm taking Cincinnati's Fountain Square, and plopping it with the fountain centered on 16th Street, so it interrupts the grid (we'll let the mall shuttle go through the square, but make it shuffle a bit to either side of the fountain).
metro-cincinnati.info
It's the right size and the right shape. The fountain in the middle is exactly perfect (right size, right amount of ornament, has a seating ledge). I wish the outer edges had a little more green (the mall shuttle could be the boundary between the plaza center and park-like outer sections), but this is the closest to what I want that I can think of.
Location? We could put it between Arapahoe and Curtis (incorporating Skyline Park, I guess), but I'd prefer a little more uptown. Between Tremont and Glenarm (knocking down the half block of buildings on either side) is about right, and would finally give us us a clear head-on view of the Pavilions' Denver sign, but the problem with that is Republic Plaza's underused plaza right across the street, which starts to become too much plaza. And I don't want to put Fountain Square on Republic Plaza, because that's a little
too uptown. And I don't want to go a block or two west because I don't want to knock down any historic midrises.