Some tents, gazebos and other temporary constructions commercially available...

Field Candy

http://www.fieldcandy.com/_all

Interesting tents that are available from Field Candy, based in the UK. Photo prints of various querky themes - Circus Tent, Machines, Wedge of Cheese -  all sorts!

You can see how a water melon or two would fit in well at Glastonbury!

http://www.juxtapoz.com/current/tents-as-art-projects

Multi-purpose hexagon gazebo, large family tent

http://www.aliexpress.com/item/2013-New-hot-sale-Multi-purpose-hexagon-gazebo-large-family-tent/745404616.html

Not too sure on the colours, but I do like the shape of this tent.

Gala Tents - Star Shades

http://www.galatent.co.uk/gala-tent-star-shade.asp

I like this design - effective and looks different. Not quite what I'm looking for though - I need sides and perhaps not so tall!

http://www.galatent.co.uk

I think ultimately though, tents are not practical for use in residential homes. They are not a good structure for access, have floors which are a trip hazard and are not quite right for this venture.