Do they have to be paint buckets? I would think they would not be good for gardening? Maybe others will know more about that. But in the U.S. you can get 5 gallon buckets from some local businesses like bakeries, food store chains, places like those that regularly use items they get in the buckets. For instance a bakery usually gets stuff in 5 gallon buckets and often has to throw them into a dumpster as they can only save so many. Some businesses now sell them for a small fee, maybe 1 dollar U.S. each and some just give them away. I think the cost of shipping them to India would be more than the cost of buying them. You could try setting up a fund on Kiva.org and possibly get enough donations to purchase food grade buckets instead of using ones from paint. Good luck with this project and please update us as to your progress.

Firstly, one can play a lot with furnishings if you are staying in a rented apartment. those white walls are nothing but a clean canvas and you can really use colors through your furnishings like cushions , upholstery, curtains , rugs etc to add colors . Secondly , instead of wall shelves etc add small side tables on emptycorners you get etc which gives you platform surfaces to display your nick knacks.. You get many freestanding display shelves online and in market where you don't have to use screws in wall. :)

A rug with a horizontal pattern could help along with a false ceiling above in which you can install a line of recessed lights. The tiles and border on the walls suggest that this is a passage in a shared washroom space like a health club. It looks a bit cold for that reason. So hang a lot of warm framed prints to make this space more inviting.

As Mr Raghu has commented, designer pieces (in whatever category) are not for ergonomics or practicality for normal use. This one is a famous design by a group of professors at the Victoria University of Wellington, New Zealand to aid Autism. You will have to order a piece from New Zealand to be true to its purpose. Copying can be done by a skilled carpenter in India, no doubt, but would still be expensive and a fake. Expert from Inhabitat website: Cradle is a sustainable rocking chair created by a collaborative effort to aid people with autism and Rhythmic Movement Disorder (RMD). Developed within the Victoria University of Wellington, this cocoon-like seat is made from cold-bent plywood. Because rocking is one of the calming activities that is recommended for autistic folks, this special seat is a soothing and aesthetically pleasing addition to their homes.