As yarnbombing projects get bigger and bigger, it seems there are no structures to large to cover.
In Pittsburgh more than 1,800 knitters have been hard at work covering the Andy Warhol Bridge in hundreds of knitted panels.
Working all weekend long the group attached 580 handmade blanket-sized panels to the pedestrian walkways along the downtown bridge, with riggers attaching larger sections to each of the towers.
Amanda Gross, who had the idea for the project said that planning and permitting started around 18 months ago.
She told Associated Press: "The country doesn't have a public arts policy. It was a big learning process for everybody.
The 29-year-old explained that after moving to the area five years ago she soon noticed how crucial bridges are to the city, due to the need to cross its three major rivers.
Knitters from more than 80 Pittsburgh neighbourhoods and 120 area townships signed up to help with what the Fiberarts Guild of Pittsburgh has termed the nation's largest yarnbomb to date.
She described the activity as being "really inspirational" and a brilliant way in which to unite communities under one common cause.
Despite the spontaneous idea of yarnbombing, many of these projects are anything but - requiring months and sometimes years of planning, logistics, organising and knitting in order for them to become a reality.
The Pittsburgh group worked with designers, lawyers, architects, structural engineers and riggers in order to make sure the yarnbomb was a success.
Ms Gross said that there were many considerations to be made, including what coloured yarns and types it would be best to use.
"Our structural engineer calculated the weight of the yarn, and also when it's wet. It was insignificant compared to traffic," she went on to add.
Visitors can join in with a community arts and crafts party held on the bridge on August 25th and the installation will remain covered until September 6th.