I find the only time I wish the iPad were smaller would be for reading, though I think I would rather have a separate device like a Kindle than a smaller iPad.
I find that I more often wish it were a little larger so that art+sound apps could have more tools onscreen at once.
http://minus20.e-2.org/artists_projects_chriso.html
Last year I re-made it as a free iOS app which takes the time and converts it using a RGB>HEX function I found that I think is correct:
http://itunes.apple.com/us/app/time-as-color/id335133255?mt=...
I also made one that sets Hour, Minute to latitude,longitude in Google maps which I like looking at: http://itunes.apple.com/us/app/time-as-place/id336539483?mt=...
(edited second link)