Not sure why anyone would want to do this, but I'm sure there are line-ups...

You should recognize Milan from NYC...

http://oneandother.co.uk/

In 1999, a new project began to rotate pieces of modern art, chosen by competition, on this fourth plinth, a use that has proved to be very popular and successful (if sometimes controversial).

The latest project is probably the most fun, and also the most interesting and democratic use of this public art space. For 100 days (starting July 6), various people will stand for one hour each on the plinth, 24 hours a day. Anyone can apply to do so, and the 2,400 participants will be chosen completely at random from the people who apply, assigned a random time, and be able to do pretty much whatever they choose during their 60 minutes.

http://spacing.ca/wire/2009/03/11/anyone-can-be-a-monument-for-60-minutes/